chore(ci): modernize Renovate config

[vdusek]

Modernizes the Renovate config to the current schema. Renovate v36+ renamed several options, and renovate-config-validator --strict reported that the config needs migration. Applies exactly the migrations the validator prescribes:

• config:base → config:recommended
• pinVersions: false → rangeStrategy: "replace"
• matchPaths → matchFileNames

Also fixes the inconsistent indentation of the last packageRules entry (10 → 12 spaces).

No behavior change: after the change the config validates cleanly (Config validated successfully), whereas before it emitted Config migration necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.54%. Comparing base (25c4087) to head (1367f80).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #921   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files          48       48           
  Lines        5100     5100           
=======================================
  Hits         4822     4822           
  Misses        278      278           

Flag	Coverage Δ
integration	93.01% <ø> (+0.09%)	⬆️
unit	83.37% <ø> (ø)

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