{Packaging} Update Homebrew template to use python3.10 executable

[chenrui333]

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[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change
[Component Name 2] az command b: Add some customer-facing feature

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update brew PR template, relates to Homebrew/homebrew-core#109727

[ghost]

Thank you for your contribution chenrui333! We will review the pull request and get back to you soon.

[yonzhan]

homebrew

[carlocab]

For context here:

We recently changed the way we package Python formulae. The latest version will have a python3 executable added to the user's PATH, while earlier versions will only have ones with both the major and minor version. For example, brew install python@3.9 adds only python3.9 to your PATH, and no python3 will be in its bin directory. See Homebrew/homebrew-core#107517.

Hence, it makes sense to fully qualify python3 as python3.10 to make sure the reference is not broken when Python 3.11 is packaged in Homebrew.

[bebound]

@carlocab Correct me if I'm wrong. When 3.11 is not released, this PR makes no difference. After 3.11 is out, it will prevent linking python3 in user PATH?

[carlocab]

When 3.11 is released, python@3.10 will not have a python3 in its bin directory. It will only have python3.10, so we cannot rely on calling python3.10 as python3.

[bebound]

@chenrui333 Could you please sync this PR with dev branch? Thank you.

[carlocab]

ping @chenrui333