chore: Officially support PDM 2.25, pylock

[GabDug]

• Add PDM 2.25 to tested versions
• Add a test-case with basic pylock.toml lockfile

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.50%. Comparing base (b6e33ba) to head (04b18b4).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   96.50%   96.50%           
=======================================
  Files           9        9           
  Lines         572      572           
  Branches       55       55           
=======================================
  Hits          552      552           
  Misses         18       18           
  Partials        2        2           

Flag	Coverage Δ
unittests	96.32% <ø> (ø)

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