Update gradle/actions action to v6 (#179)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6.0.2
-      - uses: gradle/actions/wrapper-validation@v5
+      - uses: gradle/actions/wrapper-validation@v6
       - name: Set up JDK
         uses: actions/setup-java@v5
         with:

.github/workflows/verify.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6.0.2
-      - uses: gradle/actions/wrapper-validation@v5
+      - uses: gradle/actions/wrapper-validation@v6
       - name: Set up JDK
         uses: actions/setup-java@v5
         with: