Bump guibranco/github-csharpier-linter-action from 1.0.20 to 1.0.21 (#860)

Bumps [guibranco/github-csharpier-linter-action](https://github.com/guibranco/github-csharpier-linter-action) from 1.0.20 to 1.0.21.
- [Release notes](https://github.com/guibranco/github-csharpier-linter-action/releases)
- [Commits](guibranco/github-csharpier-linter-action@v1.0.20...v1.0.21)

---
updated-dependencies:
- dependency-name: guibranco/github-csharpier-linter-action
  dependency-version: 1.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/linter.yml

@@ -12,4 +12,4 @@ jobs:
       pull-requests: write
     steps:
       - name: CSharpier Linter
-        uses: guibranco/github-csharpier-linter-action@v1.0.20
+        uses: guibranco/github-csharpier-linter-action@v1.0.21