Merge pull request #478 from cibere/bump-action-cache-version

bump actions/cache version from 2 to 4

Author: cibere

.github/workflows/test-python.yml

@@ -47,7 +47,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ github.event.inputs.pyversion }}
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         if: startsWith(runner.os, 'Windows')
         with:
           path: ~\AppData\Local\pip\Cache