Bump rhysd/actionlint from 1.7.6 to 1.7.7 in /.github/workflows

Bumps rhysd/actionlint from 1.7.6 to 1.7.7.

---
updated-dependencies:
- dependency-name: rhysd/actionlint
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/actionlint.dockerfile

@@ -1,3 +1,3 @@
 # Since dependabot cannot update workflows using docker,
 # we use this indirection since dependabot can update this file.
-FROM rhysd/actionlint:1.7.6@sha256:e3856d413f923accc4120884ff79f6bdba3dd53fd42884d325f21af61cc15ce0
+FROM rhysd/actionlint:1.7.7@sha256:887a259a5a534f3c4f36cb02dca341673c6089431057242cdc931e9f133147e9