Nudge message 3.11

[sameer-google]

• Users running Python versions other than 3.5 to 3.11 will see a message:

gsutil is supported only for python version 3.5 to 3.11

• Added a guide for managing Python versions CL for documentation: cl/676817175

Note on Tests Failure:

• Kokoro tests are failing due to an unrelated test,
  metrics.TestMetricsIntegrationTests.testMetricsPosting
• A bug has been created to track this issue: b/369285587.

[sushantkhanna]

Please fold your commits into one in your feature branch so that Mergr and Rebase is cleaner when this PR is merged.

[sushantkhanna]

Please compare the checks with previous PRs. Some have been failing due to an unrelated issue, so as long as that is the case, we should be ok. But if there is any new chnage, then we need to address that.

[sushantkhanna]

Please re-run checks failing on test_parallel_rewrite_bucket_flat_wildcard and/or test_cp_preserve_no_owner individually to rule out intermittent errors.
Metrics related failures have been discussed and we are going ahead despite those.

[sameer-google]

Please re-run checks failing on test_parallel_rewrite_bucket_flat_wildcard and/or test_cp_preserve_no_owner individually to rule out intermittent errors. Metrics related failures have been discussed and we are going ahead despite those.

• Ran the tests individually and they ran successfully, only failure is the metrics issue as discussed earlier.
• logs of both tests:
  [linux py38 json log]
  [windows py310 xml log]

[acecilia]

👋 After this PR, using latest python versions 3.12 or 3.13 leads to being unable to run gsutil, and seeing the above error. Until now I have been able to run gsutil with python 3.12 without issues for my usecase.

• Given that many users may have installed the latest python versions, arent you concerned this validation may be problematic, preventing a big percentage of current gsutil users from running gsutil?

For context: I detected this after updating to Google Cloud CLI version 497. Version 496 works fine, as it does not include this version check

[sameer-google]

👋 After this PR, using latest python versions 3.12 or 3.13 leads to being unable to run gsutil, and seeing the above error. Until now I have been able to run gsutil with python 3.12 without issues for my usecase.

• Given that many users may have installed the latest python versions, arent you concerned this validation may be problematic, preventing a big percentage of current gsutil users from running gsutil?

For context: I detected this after updating to Google Cloud CLI version 497. Version 496 works fine, as it does not include this version check

We are currently working on fully supporting Python 3.12. In the meantime, you can continue using gsutil version 5.30, which is included with Google Cloud CLI version 496. This version does not include the new version check, allowing you to use Python 3.12 without issues.