[Java] Ensure sample app is built with gradle 8.14 (#453)

Author: majanjua-amzn

.github/workflows/java-sample-app-s3-deploy.yml

@@ -48,6 +48,11 @@ jobs:
           role-to-assume: arn:aws:iam::${{ env.ACCOUNT_ID }}:role/${{ env.E2E_TEST_ROLE_NAME }}
           aws-region: ${{ matrix.aws-region }}
 
+      - name: Setup Gradle 8.14
+        uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: '8.14'
+
       - name: Build and Upload Main Jar
         working-directory: sample-apps/java/springboot-main-service
         run: |
@@ -86,6 +91,11 @@ jobs:
           role-to-assume: arn:aws:iam::${{ env.ACCOUNT_ID }}:role/${{ env.E2E_TEST_ROLE_NAME }}
           aws-region: ${{ matrix.aws-region }}
 
+      - name: Setup Gradle 8.14
+        uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: '8.14'
+
       - name: Build and Upload Remote Jar
         working-directory: sample-apps/java/springboot-remote-service
         run: |
@@ -106,6 +116,11 @@ jobs:
           java-version: ${{ matrix.java-version }}
           check-latest: true
 
+      - name: Setup Gradle 8.14
+        uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: '8.14'
+
       - name: Configure AWS Credentials
         uses: aws-actions/configure-aws-credentials@v4
         with:
@@ -140,6 +155,11 @@ jobs:
           java-version: ${{ matrix.java-version }}
           check-latest: true
 
+      - name: Setup Gradle 8.14
+        uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: '8.14'
+
       - name: Configure AWS Credentials
         uses: aws-actions/configure-aws-credentials@v4
         with: