Base the version bump PR on master

Author: henrymercer

.github/workflows/release.yml

@@ -108,4 +108,5 @@ jobs:
           title: Bump version to ${{ steps.bump-patch-version.outputs.next_version }}
           body: This PR was automatically generated by the GitHub Actions release workflow in this repository.
           branch: ${{ format('version/bump-to-{0}', steps.bump-patch-version.outputs.next_version) }}
-          branch-suffix: none
+          branch-suffix: none
+          base: master