Bump peter-evans/create-pull-request from 6 to 7

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 6 to 7.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v6...v7)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/update-ghc.yaml

@@ -30,7 +30,7 @@ jobs:
         run: nix shell 'nixpkgs#bazel-buildtools' 'nixpkgs#python3' --command python .github/update-ghc.py ${{ matrix.ghc }}
       - name: Create Pull Request
         if: steps.ghc_update.outputs.latest != ''
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           commit-message: "Add GHC bindist version ${{ steps.ghc_update.outputs.latest }}"
           title: "[update] GHC ${{ matrix.ghc }}"