Refactor CI, deps, bots

[tb1337]

This branch refactors everything related to CI, deps and bots.

Removed dependabot, added renovate.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.16%. Comparing base (df88449) to head (c3c99fb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   97.48%   98.16%   +0.67%     
==========================================
  Files          34       34              
  Lines        1472     1470       -2     
  Branches      191      191              
==========================================
+ Hits         1435     1443       +8     
+ Misses         20       13       -7     
+ Partials       17       14       -3     

Files	Coverage Δ
src/pypaperless/__init__.py	100.00% <ø> (ø)
src/pypaperless/api.py	96.79% <100.00%> (ø)
src/pypaperless/const.py	100.00% <100.00%> (ø)
src/pypaperless/exceptions.py	100.00% <100.00%> (ø)
src/pypaperless/helpers.py	100.00% <100.00%> (ø)
src/pypaperless/models/__init__.py	100.00% <100.00%> (ø)
src/pypaperless/models/base.py	100.00% <100.00%> (ø)
src/pypaperless/models/classifiers.py	100.00% <100.00%> (ø)
src/pypaperless/models/common.py	100.00% <100.00%> (ø)
src/pypaperless/models/config.py	100.00% <100.00%> (ø)
... and 24 more

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Security Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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