replacing deprecated openjdk

Author: l-trotta

.ci/Dockerfile

@@ -20,7 +20,7 @@
 # Build a Docker image that has Gradle and all project dependencies ready.
 # Needs to be run with .git and java-client/src mounted under /elasticsearch-java.
 
-FROM openjdk:17
+FROM eclipse-temurin:17
 
 # Default UID/GID to 1000
 # it can be overridden at build time

.github/workflows/unit-tests.yml

@@ -19,8 +19,6 @@ jobs:
         with:
           java-version: '8'
           distribution: 'temurin'
-      - name: Enable gradle wrapper execution
-        run: chmod +x gradlew
 
       - name: Run java client tests
         run: ./gradlew test -p java-client