Bump actions/checkout from 2 to 3

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: "ubuntu-latest"
     name: Check code quality
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v3"
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
         uses: actions/setup-python@v2.2.2
@@ -37,7 +37,7 @@ jobs:
     runs-on: "ubuntu-latest"
     name: Run tests
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v3"
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
         uses: actions/setup-python@v2.2.2

.github/workflows/codeql-analysis.yml

@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/python-publish.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout the repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: 🔢 Get release version
         id: version