Use apt-get to install towncrier

Thanks to PEP 668.

.github/workflows/towncrier.yml

@@ -14,7 +14,6 @@ jobs:
 
  - name: Install towncrier
  run: |
- pip install -U pip
- pip install towncrier
+ sudo apt-get install -y --no-install-recommends towncrier
  - name: Check for changelog file
  run: towncrier check --compare-with origin/master