Bump tim-actions/get-pr-commits from 1.1.0 to 1.3.1

Bumps [tim-actions/get-pr-commits](https://github.com/tim-actions/get-pr-commits) from 1.1.0 to 1.3.1.
- [Release notes](https://github.com/tim-actions/get-pr-commits/releases)
- [Commits](tim-actions/get-pr-commits@v1.1.0...v1.3.1)

---
updated-dependencies:
- dependency-name: tim-actions/get-pr-commits
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/dco.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
     - name: Get PR Commits
       id: 'get-pr-commits'
-      uses: tim-actions/get-pr-commits@v1.1.0
+      uses: tim-actions/get-pr-commits@v1.3.1
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
     - name: DCO Check