Unpinned ruff for CI + Cleaned up workflow files a little

[RobertoRoos]

Resolves

• Bump ruff version in Github CI #78

After #74 is merged we can also test on Python v3.14.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 46.86%. Comparing base (cf1fbb7) to head (bf3bc3a).

Files with missing lines	Patch %	Lines
sphinxarg/parser.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   46.86%   46.86%           
=======================================
  Files          12       12           
  Lines         958      958           
  Branches      205      205           
=======================================
  Hits          449      449           
  Misses        468      468           
  Partials       41       41           

Flag	Coverage Δ
unittests	46.86% <0.00%> (ø)

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[RobertoRoos]

Annoying, after #83 the test for Python 3.14 fail (and rightly so). Let's merge #84 first, then we rebase this and merge it too.

A draft PR of both together can be found here (it seems to work): RobertoRoos#2