use ubuntu-slim and dependabot

[methane]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.43%. Comparing base (1e28be8) to head (24868a8).
⚠️ Report is 60 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #1226 +/- ##
==========================================
- Coverage 86.24% 84.43% -1.82% 
==========================================
Files 17 17 Lines 2436 2441 +5 Branches 258 241 -17 ==========================================
- Hits 2101 2061 -40 - Misses 249 295 +46 + Partials 86 85 -1 

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[Copilot]

Pull request overview

This PR updates CI configuration by changing the GitHub Actions runner used for linting and adding a Dependabot configuration to keep GitHub Actions dependencies up to date.

Changes:

• Switch the lint workflow runner from ubuntu-latest to ubuntu-slim
• Add .github/dependabot.yml to enable weekly GitHub Actions version updates

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/lint.yaml	Changes the runner used for the lint job
.github/dependabot.yml	Adds Dependabot config for weekly GitHub Actions updates

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[Copilot]

runs-on: ubuntu-slim is not a supported GitHub-hosted runner label, so this workflow will fail to start. Use a valid runner label (e.g., ubuntu-latest like the other workflows in this repo, or a specific Ubuntu version such as ubuntu-24.04).

Suggested change

	runs-on: ubuntu-slim
	runs-on: ubuntu-latest