Update peter-evans/create-pull-request action to v7 (#125)

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

Author: renovate[bot]

.github/workflows/bump.yml

@@ -133,7 +133,7 @@ jobs:
       - name: Create Pull Request
         id: cpr
         if: env.CABAL_COUNT > 0 && steps.dependency-build.outcome == 'success'
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v7
         with:
           branch: "cabal-updates"
           title: ${{ env.GIT_PR_TITLE }}