Update the GitHub Actions configuration (#1416)

Author: stof

.github/workflows/checks.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Modify composer.json
         run: |

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
           coverage: none
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Initialize tests
         run: make initialize