Bump taiki-e/github-actions/.github/workflows/rust-check-external-types.yml (#1332)

Bumps [taiki-e/github-actions/.github/workflows/rust-check-external-types.yml](https://github.com/taiki-e/github-actions) from 2026.8.8 to 2026.9.9.
- [Release notes](https://github.com/taiki-e/github-actions/releases)
- [Commits](taiki-e/github-actions@dc24bff...04a42ca)

---
updated-dependencies:
- dependency-name: taiki-e/github-actions/.github/workflows/rust-check-external-types.yml
  dependency-version: 2026.9.9
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ concurrency:
 
 jobs:
   check-external-types:
-    uses: taiki-e/github-actions/.github/workflows/rust-check-external-types.yml@dc24bff2366e8ddeea5e0e4168df3d6f4b93f596 # 2026.8.8
+    uses: taiki-e/github-actions/.github/workflows/rust-check-external-types.yml@04a42ca09aaeb9b6c0bce43c23fb9e13eb197d85 # 2026.9.9
   clippy:
     uses: taiki-e/github-actions/.github/workflows/rust-clippy.yml@04a42ca09aaeb9b6c0bce43c23fb9e13eb197d85 # 2026.9.9
     with: