Update upstream GitHub Actions

Author: d7415

.github/workflows/ci.yml

@@ -20,8 +20,8 @@ jobs:
         tox-test: ["default"]
 
     steps:
-      - uses: "actions/checkout@v2"
-      - uses: "actions/setup-python@v2"
+      - uses: "actions/checkout@v3"
+      - uses: "actions/setup-python@v4"
         with:
           python-version: "${{ matrix.python-version }}"
       - name: "Install test locales"