ci: setup-python action at v4 now.

Author: philj404

.github/workflows/githubci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
     - uses: actions/checkout@v3