Merge pull request matplotlib#22573 from matplotlib/dependabot/github_actions/actions/setup-python-3

CI: Bump actions/setup-python from 2 to 3

Author: tacaswell

.github/workflows/cibuildwheel.yml

@@ -52,7 +52,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         name: Install Python
         with:
           python-version: '3.8'

.github/workflows/reviewdog.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Python 3
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v3
         with:
           python-version: 3.8
 

.github/workflows/tests.yml

@@ -58,7 +58,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}