Add Dependabot configuration for uv and npm

[juhoinkinen]

PR #6 added the .github/dependabot.yml file with config only for GH Actions updates.

Now this adds configs also for uv and npm controlled dependencies, and groups all updates to a single PR and uses 10 days cooldown for all dependecies.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.58%. Comparing base (c0d74a6) to head (5180455).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files           6        6           
  Lines          68       68           
=======================================
  Hits           65       65           
  Misses          3        3           

Flag	Coverage Δ
unittests	95.58% <ø> (ø)

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[Copilot]

Pull request overview

Expands the repository’s Dependabot setup beyond GitHub Actions to also cover application dependencies, aiming to group updates into a single PR with a shared cadence/cooldown.

Changes:

• Introduces a multi-ecosystem-groups section intended to centralize scheduling/cooldown behavior.
• Adds Dependabot update entries for uv and npm, and assigns all ecosystems to the same group.

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[osma]

Looks like the Copilot review is at least partly rubbish. Anyway, might be worth checking out. LGTM