bring GH action versions uptodate

Author: petercorke

.github/workflows/master.yml

@@ -42,9 +42,9 @@ jobs:
  needs: unittest
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v4
  - name: Set up Python 3.7
- uses: actions/setup-python@v1
+ uses: actions/setup-python@v5
  with:
  python-version: 3.7
  - name: Install dependencies