bump GitHub Actions checkout to v4

Author: cbouy

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Get prerelease version tags
       if: env.IS_PRERELEASE == 'true'

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
             coverage: false
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup Conda
       uses: conda-incubator/setup-miniconda@v2

.github/workflows/codeql.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2

.github/workflows/formatting.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Code formatting
         uses: psf/black@stable