update GitHub actions/checkout to 5

Author: thestinger

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:

.github/workflows/validate-gradle-wrapper.yml

@@ -7,5 +7,5 @@ jobs:
     name: Validation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: gradle/actions/wrapper-validation@v4