CI: update actions/checkout to v4

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
         type: [Release, Debug]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -61,7 +61,7 @@ jobs:
       matrix:
         type: [Release, Debug]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -76,7 +76,7 @@ jobs:
   check_format:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true