Bump Python to 3.9.2

What does this MR do?

Bumps Python to 3.9.2

Related issues

Closes https://gitlab.com/gitlab-org/charts/gitlab/-/issues/2594.

Testing

helm install XYZ gitlab/gitlab --set global.gitlabVersion=upgrade-to-python-3-9-2

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated