ci: Update to actions/checkout@v3

Author: Alan Christie

.github/workflows/build.yaml

@@ -35,7 +35,7 @@ jobs:
         - '3.10'
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/publish.yaml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Inject slug/short variables
       uses: rlespinasse/[email protected]
     - name: Set up Python