build(deps): bump shogo82148/actions-goveralls from 1.9.0 to 1.9.1

Bumps [shogo82148/actions-goveralls](https://github.com/shogo82148/actions-goveralls) from 1.9.0 to 1.9.1.
- [Release notes](https://github.com/shogo82148/actions-goveralls/releases)
- [Commits](shogo82148/actions-goveralls@785c9d6...e6875f8)

---
updated-dependencies:
- dependency-name: shogo82148/actions-goveralls
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/ci.yaml

@@ -67,7 +67,7 @@ jobs:
           gocovmerge unit.out integration.out > cov.out
 
       - name: Upload coverage to Coveralls
-        uses: shogo82148/actions-goveralls@785c9d68212c91196d3994652647f8721918ba11 # v1.9.0
+        uses: shogo82148/actions-goveralls@e6875f831db61e6abffbd8df91a2eb6cd24b46c9 # v1.9.1
         with:
           path-to-profile: cov.out