STR-676: sets a CI autoupdate cron job

[storopoli]

Description

Spinoff of #537.

Adds a CI cron job to do an automated PR monthly.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency Update
• New CI action

Notes to Reviewers

Depends on https://github.com/organizations/alpenlabs/settings/actions and check Allow GitHub Actions to create and approve pull requests.

If you look closely, you might find a Ramanujan number hidden in this PR.

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.

Related Issues

STR-676
STR-630

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.74%. Comparing base (5008f3d) to head (870f610).
Report is 4 commits behind head on main.

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
- Coverage   56.76%   56.74%   -0.03%     
==========================================
  Files         306      309       +3     
  Lines       31263    31387     +124     
==========================================
+ Hits        17747    17809      +62     
- Misses      13516    13578      +62     

see 26 files with indirect coverage changes

[Rajil1213]

Left a few nits.

[delbonis]

Agree with ^comments.