Update reviewdog/action-yamllint action to v1.21.0 (#488)

| datasource  | package                   | from    | to      |
| ----------- | ------------------------- | ------- | ------- |
| github-tags | reviewdog/action-yamllint | v1.20.0 | v1.21.0 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/lint.yml

@@ -70,4 +70,4 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Lint YAML
-        uses: reviewdog/action-yamllint@1dca3ad811867be18fbe293a9818d715a6c2cd46 # v1.20.0
+        uses: reviewdog/action-yamllint@f01d8a48fd8d89f89895499fca2cff09f9e9e8c0 # v1.21.0