Upgrade GitHub Actions (#919)

New versions use Node 16.

Author: adamchainz

.github/workflows/main.yml

@@ -49,9 +49,9 @@ jobs:
       DB_PASSWORD: hunter2
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
         cache: pip
@@ -71,7 +71,7 @@ jobs:
       run: tox --py current
 
     - name: Upload coverage data
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: coverage-data
         path: '.coverage.*'
@@ -81,17 +81,17 @@ jobs:
     runs-on: ubuntu-20.04
     needs: tests
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         with:
           python-version: '3.10'
 
       - name: Install dependencies
         run: python -m pip install --upgrade coverage[toml]
 
       - name: Download data
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: coverage-data
 
@@ -103,7 +103,7 @@ jobs:
 
       - name: Upload HTML report
         if: ${{ failure() }}
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: html-report
           path: htmlcov