CI: Add Python 3.10 and 3.11, update actions

[willianrocha]

A bit of CI maintenance:

• Add Python 3.10 and 3.11 runs, and update the PyPy run to PyPy 3.9
• Update the used actions to the latest versions
• Also run on pushes, when manually triggered (workflow_dispatch)

I could not rebase and reuse the old PR https://github.com/bndr/pipreqs/pull/334

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (next@cebc3f7). Click here to learn what that means.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #398 +/- ## ======================================= Coverage ? 86.97% ======================================= Files ? 2 Lines ? 261 Branches ? 0 ======================================= Hits ? 227 Misses ? 34 Partials ? 0 ```

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[fredgrub]

You should mention the PR (and the author) in the commit. According to Alan's suggestion in https://github.com/bndr/pipreqs/pull/396#issuecomment-1742992660.

[alan-barzilay]

https://docs.python.org/3.12/whatsnew/3.12.html

add python 3.12 please

[alan-barzilay]

actually, please use all supported pythonv ersions and remove unsupported ones

https://devguide.python.org/versions/