Attempt 2

Author: schivmeister

.github/workflows/main.yml

@@ -10,9 +10,9 @@ on:
 
 # Ensure redundant parallel runs don't occur in the same workflow.
 # Use either PR or branch information to prevent such runs.
-# concurrency:
-#   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-#   cancel-in-progress: true
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 # A workflow run is made up of one or more jobs that can run sequentially or in
 # parallel
@@ -27,6 +27,9 @@ jobs:
         os: ['ubuntu-latest', 'windows-latest']
     # The type of runner that the job will run on
     runs-on: ${{ matrix.os }}
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{ matrix.os }}-${{ matrix.python-version}}
+      cancel-in-progress: true
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps: