Bump brettcannon/check-for-changed-files from 1.2.0 to 1.2.1

Bumps [brettcannon/check-for-changed-files](https://github.com/brettcannon/check-for-changed-files) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/brettcannon/check-for-changed-files/releases)
- [Commits](brettcannon/check-for-changed-files@4170644...871d7b8)

---
updated-dependencies:
- dependency-name: brettcannon/check-for-changed-files
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/release-notes-check.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - name: Check for a release notes update
         if: github.event_name == 'pull_request'
-        uses: brettcannon/check-for-changed-files@4170644959a21843b31f1181f2a1761d65ef4791 # v1.2.0
+        uses: brettcannon/check-for-changed-files@871d7b8b5917a4f6f06662e2262e8ffc51dff6d1 # v1.2.1
         with:
           file-pattern: "RELEASE_NOTES.md"
           prereq-pattern: "src/**"