Update peter-evans/create-pull-request action to v5

Author: renovate[bot]

.github/workflows/site.yml

@@ -84,7 +84,7 @@ jobs:
         git add README.md
         git commit -m "Update README.md" || echo "No changes to commit"
     - name: Create Pull Request
-      uses: peter-evans/create-pull-request@v4.2.3
+      uses: peter-evans/create-pull-request@v5.0.0
       with:
         body: |-
           Autogenerated changes after running the `sbt docs/generateReadme` command of the [zio-sbt-website](https://zio.dev/zio-sbt) plugin.