chore(deps): bump reviewdog/action-shellcheck from 1.19 to 1.20

Bumps [reviewdog/action-shellcheck](https://github.com/reviewdog/action-shellcheck) from 1.19 to 1.20.
- [Release notes](https://github.com/reviewdog/action-shellcheck/releases)
- [Commits](reviewdog/action-shellcheck@v1.19...v1.20)

---
updated-dependencies:
- dependency-name: reviewdog/action-shellcheck
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/pr.yml

@@ -7,7 +7,7 @@ jobs:
     steps:
       - uses: actions/[email protected]
       - name: shellcheck
-        uses: reviewdog/action-shellcheck@v1.19
+        uses: reviewdog/action-shellcheck@v1.20
         with:
           github_token: ${{ secrets.github_token }}
           path: 'commit-msg'