Change python version in workflow from 3.7 to 3.7.1

Author: stijnh

.github/workflows/python-app.yml

@@ -18,7 +18,7 @@ jobs:
     needs: build-python-38
     uses: ./.github/workflows/python-action.yml
     with:
-      python-version: "3.7"
+      python-version: "3.7.1"
 
   build-python-39:
     needs: build-python-38