Update dependabot configuration

[martincostello]

Refactor to allow renovate updates to be auto-merged.

[Copilot]

Pull Request Overview

Refactors the Dependabot setup to stop NuGet updates and only run GitHub Actions updates annually.

• Swaps the package-ecosystem from nuget to github-actions
• Removes the NuGet-specific open-pull-requests-limit and ignore rules
• Retains a yearly schedule for workflow updates

Comments suppressed due to low confidence (3)

.github/dependabot.yml:3

• [nitpick] If the aim is to migrate NuGet updates entirely to Renovate and only use Dependabot for GitHub Actions, consider adding a comment or note explaining this change to avoid confusion for future maintainers.

- package-ecosystem: github-actions

.github/dependabot.yml:6

• An annual update cadence may delay critical workflow fixes or security patches; consider using a more frequent schedule like weekly or monthly for GitHub Actions updates.

    interval: yearly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.59%. Comparing base (659fdb4) to head (6f1dc04).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #957   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files          16       16           
  Lines         284      284           
  Branches       37       37           
=======================================
  Hits          280      280           
  Misses          2        2           
  Partials        2        2           

Flag	Coverage Δ
linux	98.59% <ø> (ø)
macos	97.88% <ø> (ø)
windows	98.59% <ø> (ø)

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