Bump peter-evans/create-pull-request from 7 to 8 (#349)

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 7 to 8.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v7...v8)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/update_spreadsheets.yml

@@ -45,7 +45,7 @@ jobs:
         # a PR is created using the checkout branch for this workflow
         # https://github.com/peter-evans/create-pull-request
         -   name: Create Pull-Request
-            uses: peter-evans/create-pull-request@v7
+            uses: peter-evans/create-pull-request@v8
             with:
                 commit-message: Update spreadsheets
                 delete-branch: true