Bump actions/checkout from 4 to 5 (#30)

Author: dependabot[bot]

.github/workflows/gradle.yml

@@ -15,7 +15,7 @@ jobs:
           - 21
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install JDK
         uses: actions/setup-java@v5
         with:

.github/workflows/mvn.yml

@@ -16,7 +16,7 @@ jobs:
           - 21
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install JDK
         uses: actions/setup-java@v5
         with: