Restrict Actions workflow concurrency group to pull requests

.github/workflows/pypi.yml

@@ -9,8 +9,11 @@ on:
   release:
     types: [published]
 
+# Cancels all previous workflow runs for pull requests that have not completed.
 concurrency:
-  group: ${{ github.head_ref }}-pypi
+  # The concurrency group contains the workflow name and the branch name for pull requests
+  # or the commit hash for any other events.
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/test.yml

@@ -9,8 +9,11 @@ on:
     branches:
       - main
 
+# Cancels all previous workflow runs for pull requests that have not completed.
 concurrency:
-  group: ${{ github.head_ref }}-tests
+  # The concurrency group contains the workflow name and the branch name for pull requests
+  # or the commit hash for any other events.
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
 jobs: