Merge pull request #9 from timkpaine/dependabot/github_actions/actions/checkout-3

Bump actions/checkout from 2 to 3

Author: timkpaine

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
         python-version: [3.9]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with: