Bump reviewdog/action-stylelint from 1.18.1 to 1.20.1

Bumps [reviewdog/action-stylelint](https://github.com/reviewdog/action-stylelint) from 1.18.1 to 1.20.1.
- [Release notes](https://github.com/reviewdog/action-stylelint/releases)
- [Commits](reviewdog/action-stylelint@548276a...4a97984)

---
updated-dependencies:
- dependency-name: reviewdog/action-stylelint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/continuous_integration.yml

@@ -139,7 +139,7 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Stylelint modules
         # See also `composer va:test:stylelint-modules` in composer.json
-        uses: reviewdog/action-stylelint@548276a94275c7865effa8d72fa8b6983d9f47c4 # v1.18.1
+        uses: reviewdog/action-stylelint@4a979842901351a21b0402786fec92f28f6e99b6 # v1.20.1
         with:
           fail_on_error: true
           github_token: ${{ secrets.github_token }}
@@ -149,7 +149,7 @@ jobs:
           stylelint_input: 'docroot/modules/custom/**/*.css'
       - name: Stylelint themes
         # See also `composer va:test:stylelint-themes` in composer.json
-        uses: reviewdog/action-stylelint@548276a94275c7865effa8d72fa8b6983d9f47c4 # v1.18.1
+        uses: reviewdog/action-stylelint@4a979842901351a21b0402786fec92f28f6e99b6 # v1.20.1
         with:
           fail_on_error: true
           github_token: ${{ secrets.github_token }}