Bump peter-evans/create-pull-request from 3.8.2 to 8.1.1

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 3.8.2 to 8.1.1.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v3.8.2...v8.1.1)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/spec_update.yml

@@ -54,7 +54,7 @@ jobs:
           git add dropbox-sdk-dotnet/Dropbox.Api/Generated
           git add spec
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3.8.2
+        uses: peter-evans/create-pull-request@v8.1.1
         if: steps.git-diff-num.outputs.num-diff != 0
         with:
           token: ${{ secrets.SPEC_UPDATE_TOKEN }}