ci: auto-merge dependabot pull requests

[hadrien]

Problem

• Dependabot pull requests require manual approval and merging.
• Auto-merge lacked required CI gates on main.

Solution

• Require all three test matrices and Ruff on main.
• Enable repository auto-merge with squash-only merging.
• Approve Dependabot pull requests with the built-in token.
• Schedule squash merges after required checks pass.

fs-pkw

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.36%. Comparing base (cf4be1d) to head (8208cd6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   97.36%   97.36%           
=======================================
  Files           1        1           
  Lines         114      114           
  Branches        2        2           
=======================================
  Hits          111      111           
  Misses          3        3           

Flag	Coverage Δ
fastapi-post121	97.36% <ø> (ø)
fastapi-pre121	97.36% <ø> (ø)
sqlmodel	97.36% <ø> (ø)

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