Update dev-hato/actions-diff-pr-management action to v1.2.1 (#1210)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/update-dist.yml

@@ -28,7 +28,7 @@ jobs:
           node-version-file: .node-version
       - if: github.event_name != 'pull_request' || github.event.action != 'closed'
         run: bash "${GITHUB_WORKSPACE}/scripts/update_dist/update_dist/build.sh"
-      - uses: dev-hato/actions-diff-pr-management@e5c78b251a69f44f93b2f1398e06b129bcf151ec # v1.2.0
+      - uses: dev-hato/actions-diff-pr-management@8d475e5bc78f61c40024d4859b79134b66f788d2 # v1.2.1
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           branch-name-prefix: apply-dist