Update gradle/wrapper-validation-action digest to 9aa31f2 (#26)

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

Author: renovate[bot]

.github/workflows/build-on-push.yaml

@@ -23,7 +23,7 @@ jobs:
           distribution: 'temurin'
 
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@859c33240bd026ce8d5f711f5adcc65c2f8eafc1
+        uses: gradle/wrapper-validation-action@9aa31f26bc8e536d1faf4b332bb8365350743a18
 
       - name: Assemble the jar
         uses: gradle/gradle-build-action@v2