chore(deps): update actions/checkout action to v3 (#285)

Author: renovate-bot

.github/workflows/coverage.yml

@@ -26,7 +26,7 @@ jobs:
       - run: pip install nox coverage
 
       - name: Checkout base branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           ref: ${{ github.base_ref }}
       - name: Calculate base code coverage
@@ -38,7 +38,7 @@ jobs:
           coverage erase
 
       - name: Checkout PR branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Calculate PR code coverage
         run: |
           nox --sessions unit-3.10

.github/workflows/lint.yml

@@ -29,7 +29,7 @@ jobs:
         run: pip install nox
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run nox lint session
         run: nox --sessions lint