build(deps): 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]>

.github/workflows/nix-update.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: jessestricker/nix-flake-update@v1
         id: nix-update
 
-      - uses: peter-evans/create-pull-request@v6
+      - uses: peter-evans/create-pull-request@v7
         with:
           token: ${{ steps.generate-token.outputs.token }}
           branch: nix-update