Upgrade GitHub Actions (#1351)

Author: adamchainz

.github/workflows/release.yml

@@ -11,14 +11,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: '3.12'
 
       - name: Install dependencies
         run: |

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
             django-version: 'main'
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4