Revert "ENH: GHA: cancel in progress builds for pull requests"

This reverts commit 1c47251.

Author: Simon Rit

.github/workflows/build-test-cxx.yml

@@ -30,10 +30,6 @@ on:
         required: false
         type: string
 
-concurrency:
-  group: '${{ github.workflow }}@${{ github.event.pull_request.head.sha || github.head_ref || github.ref }}'
-  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
-
 jobs:
   build-test-cxx:
     runs-on: ${{ matrix.os }}

.github/workflows/build-test-package-python.yml

@@ -55,10 +55,6 @@ on:
       pypi_password:
         required: false  # Packages will not be uploaded to PyPI if not set
 
-concurrency:
-  group: '${{ github.workflow }}@${{ github.event.pull_request.head.sha || github.head_ref || github.ref }}'
-  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
-
 jobs:
 
   build-linux-py: