Chore(deps): Update zope-testrunner requirement from <8,>=5 to >=5,<9

[dependabot]

Updates the requirements on zope-testrunner to permit the latest version.

Changelog

Sourced from zope-testrunner's changelog.

8.1 (2025-10-02)

• Remove run-time dependency on setuptools.

8.0 (2025-09-12)

• Replace pkg_resources namespace with PEP 420 native namespace.

7.4 (2025-05-28)

• Add --auto-path option. This automatically adds the path of all packages from the --package option to the test paths. ([#198](https://github.com/zopefoundation/zope.testrunner/issues/198) <https://github.com/zopefoundation/zope.testrunner/pull/198>_)

7.3 (2025-05-15)

• Improve @unittest.expectedFailure support, especially regarding post-mortem debugger. ([#196](https://github.com/zopefoundation/zope.testrunner/issues/196) <https://github.com/zopefoundation/zope.testrunner/pull/196>_)

7.2 (2025-03-06)

• Re-add a single import of pkg_resources to avoid other import issues in mixed pip/buildout environments. ([#194](https://github.com/zopefoundation/zope.testrunner/issues/194) <https://github.com/zopefoundation/zope.testrunner/issues/194>_)

7.1 (2025-03-05)

• Replace pkg_resources with importlib.metadata.

7.0 (2025-02-12)

Backwards-incompatible changes

• Remove setup.py ftest command. ([#178](https://github.com/zopefoundation/zope.testrunner/issues/178) <https://github.com/zopefoundation/zope.testrunner/issues/178>_)

... (truncated)

Commits

• 7de58cb Preparing release 8.1
• 67e0566 Remove run-time dependency on setuptools (#201)
• c3cce44 Back to development: 8.1
• c78ce68 Preparing release 8.0
• 8533dfd Switch to PEP 420 native namespace. (#200)
• fa782c4 Configuring for pure-python (#197)
• 9cbf25e Merge pull request #199 from zopefoundation/release-74
• 2c5c037 Back to development: 7.5
• 2019cf3 Preparing release 7.4
• 5ae8746 Add link to PR in changelog.
• Additional commits viewable in compare view

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