ci: update checkout actions

Author: tymmesyde

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       image: ubuntu:resolute
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install dependencies
         run: |

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
             org.freedesktop.Platform.VAAPI.Intel//25.08
 
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: recursive