Enable GitHub Actions Updates in Renovate

[harryswift01]

Summary

Updates the custom Renovate configuration to include GitHub Actions dependencies alongside the existing Python dependency management.

Changes

Enable GitHub Actions Manager

• Added github-actions to the enabledManagers configuration.
• Retained the existing pep621 manager for Python dependencies.

Impact

• Allows Renovate to detect and propose updates for actions used in GitHub Actions workflows.
• Expands automated dependency management beyond Python dependencies without changing any existing Renovate behaviour.

[coveralls]

Coverage Report for CI Build 29815715415

Coverage remained the same at 92.028%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	991
Covered Lines:	912
Line Coverage:	92.03%
Coverage Strength:	5.52 hits per line

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💛 - Coveralls