chore(deps): update actions/checkout action to v3

Author: mend-for-github-com[bot]

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python
       uses: actions/setup-python@v4

.github/workflows/run_tests.yml

@@ -12,7 +12,7 @@ jobs:
         python: [3.7, 3.8, 3.9, "3.10"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Python
         uses: actions/setup-python@v4
         with: