Bump rhysd/actionlint Docker tag to v1.7.8 (#1048)

| datasource | package          | from  | to    |
| ---------- | ---------------- | ----- | ----- |
| docker     | rhysd/actionlint | 1.7.7 | 1.7.8 |

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

@@ -48,7 +48,7 @@ jobs:
       run: echo "::add-matcher::.github/actionlint-matcher.json"
 
     - name: Lint workflows with actionlint
-      uses: docker://rhysd/actionlint:1.7.7@sha256:887a259a5a534f3c4f36cb02dca341673c6089431057242cdc931e9f133147e9
+      uses: docker://rhysd/actionlint:1.7.8@sha256:96d4a8c87dbbfb3bdd324f8fdc285fc3df5261e2decc619a4dd7e8ee52bbfd46
       with:
         args: -color