chore: updates CI runners and handles failing Windows test

[rosygmiki]

This PR temporarily skips an issue where Windows builds fails when source files are missing. It also cleans up our CI workflow by removing unsupported platforms.

Tests

• Skips the missing source file test on Windows.
• Includes a bug fix which changes nil to err and adds a new test function for the added error path to satisfy Codecov patch % requirement.

Chores

• Removes CI workflow support for macOS on Intel and Windows on ARM.
  -Removes toolchain go1.26.2 so to ensure only stable version go1.26 is used
• Updates go.mod and README.md badge with Go 1.26 for version stability

Closes #84

[gemini-code-assist]

Code Review

This pull request fixes a bug in pkg/tar-patch/apply.go where an error encountered while closing the current file was being ignored and nil was returned instead of the actual error. The code has been corrected to return the err. There are no review comments to address.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.61%. Comparing base (752790f) to head (f677306).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   81.43%   81.61%   +0.17%     
==========================================
  Files          10       10              
  Lines        1115     1115              
==========================================
+ Hits          908      910       +2     
+ Misses        117      116       -1     
+ Partials       90       89       -1     

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[djach7]

A couple of change requests, thanks for working on this!

[djach7]

LGTM

[knecasov]

I added some comments.

A note regarding removing toolchain go1.26.2 in the PR description would help future readers understand the rationale.

I think that in the sentence "This PR temporarily skips an issue where Windows builds fails...", there should be "fail" instead of "fails".

[knecasov]

LGTM, thank you very much for incorporating the notes!

[semanticreleasebot-rmiki]

🎉 This PR is included in version 0.5.1 🎉

The release is available on GitHub release

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