Bump black from 25.11.0 to 26.3.1

[dependabot]

Bumps black from 25.11.0 to 26.3.1.

Release notes

Sourced from black's releases.

## 26.3.1 ### Stable style * Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely ([#5038](https://redirect.github.com/psf/black/issues/5038)) ### Configuration * Always hash cache filename components derived from `--python-cell-magics` so custom magic names cannot affect cache paths ([#5038](https://redirect.github.com/psf/black/issues/5038)) ### Blackd * Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure ([#5039](https://redirect.github.com/psf/black/issues/5039)) ## 26.3.0 ### Stable style * Don't double-decode input, causing non-UTF-8 files to be corrupted ([#4964](https://redirect.github.com/psf/black/issues/4964)) * Fix crash on standalone comment in lambda default arguments ([#4993](https://redirect.github.com/psf/black/issues/4993)) * Preserve parentheses when `# type: ignore` comments would be merged with other comments on the same line, preventing AST equivalence failures ([#4888](https://redirect.github.com/psf/black/issues/4888)) ### Preview style * Fix bug where `if` guards in `case` blocks were incorrectly split when the pattern had a trailing comma ([#4884](https://redirect.github.com/psf/black/issues/4884)) * Fix `string_processing` crashing on unassigned long string literals with trailing commas (one-item tuples) ([#4929](https://redirect.github.com/psf/black/issues/4929)) * Simplify implementation of the power operator `"hugging"` logic ([#4918](https://redirect.github.com/psf/black/issues/4918)) ### Packaging * Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments ([#4930](https://redirect.github.com/psf/black/issues/4930)) ### Performance * Introduce winloop for windows as an alternative to uvloop ([#4996](https://redirect.github.com/psf/black/issues/4996)) * Remove deprecated function `uvloop.install()` in favor of `uvloop.new_event_loop()` ([#4996](https://redirect.github.com/psf/black/issues/4996)) * Rename `maybe_install_uvloop` function to `maybe_use_uvloop` to simplify loop installation and creation of either a uvloop/winloop eventloop or default eventloop ([#4996](https://redirect.github.com/psf/black/issues/4996)) ### Output

Changelog

Sourced from black's changelog.

## Version 26.3.1 ### Stable style * Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely ([#5038](https://redirect.github.com/psf/black/issues/5038)) ### Configuration * Always hash cache filename components derived from `--python-cell-magics` so custom magic names cannot affect cache paths ([#5038](https://redirect.github.com/psf/black/issues/5038)) ### Blackd * Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure ([#5039](https://redirect.github.com/psf/black/issues/5039)) ## Version 26.3.0 ### Stable style * Don't double-decode input, causing non-UTF-8 files to be corrupted ([#4964](https://redirect.github.com/psf/black/issues/4964)) * Fix crash on standalone comment in lambda default arguments ([#4993](https://redirect.github.com/psf/black/issues/4993)) * Preserve parentheses when `# type: ignore` comments would be merged with other comments on the same line, preventing AST equivalence failures ([#4888](https://redirect.github.com/psf/black/issues/4888)) ### Preview style * Fix bug where `if` guards in `case` blocks were incorrectly split when the pattern had a trailing comma ([#4884](https://redirect.github.com/psf/black/issues/4884)) * Fix `string_processing` crashing on unassigned long string literals with trailing commas (one-item tuples) ([#4929](https://redirect.github.com/psf/black/issues/4929)) * Simplify implementation of the power operator `"hugging"` logic ([#4918](https://redirect.github.com/psf/black/issues/4918)) ### Packaging * Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments ([#4930](https://redirect.github.com/psf/black/issues/4930)) ### Performance * Introduce winloop for windows as an alternative to uvloop ([#4996](https://redirect.github.com/psf/black/issues/4996)) * Remove deprecated function `uvloop.install()` in favor of `uvloop.new_event_loop()` ([#4996](https://redirect.github.com/psf/black/issues/4996)) * Rename `maybe_install_uvloop` function to `maybe_use_uvloop` to simplify loop installation and creation of either a uvloop/winloop eventloop or default eventloop ([#4996](https://redirect.github.com/psf/black/issues/4996))

Note: Black 26.3.1 introduced a formatting change that removes blank lines after docstrings at the top of files. This PR has been fixed by applying the automatic reformatting.

All checks pass:

• ✅ Formatting (black 26.3.1 + isort)
• ✅ mypy type checking
• ✅ flake8 linting
• ✅ pytest tests (both min and max dependencies)

[Marenz]

The PR has been fixed. Black 26.3.1 introduced a change that removes blank lines after docstrings at the top of files. The fix applies the automatic reformatting to keep the code consistent with the new version.

All checks pass:

• ✅ Formatting (black 26.3.1 + isort)
• ✅ mypy type checking
• ✅ flake8 linting
• ✅ pytest tests (both min and max dependencies)