Update runtime JDK version to 17, upgrade Spark and slf4j version.

Also update chatty health probe logger to debug.

Dockerfile

@@ -16,13 +16,13 @@
 #
 #
 
-FROM gradle:8.6-jdk11-alpine AS builder
+FROM gradle:8.6-jdk17-alpine AS builder
 ARG BASE_VERSION
 WORKDIR /app
 COPY . .
 RUN ./gradlew clean build -x test
 
-FROM eclipse-temurin:11-jre-jammy
+FROM eclipse-temurin:17-jre-jammy
 ARG BASE_VERSION
 
 ENV SPARK_OPERATOR_HOME=/opt/spark-operator

gradle.properties

@@ -21,17 +21,17 @@ commonsLang3Version=3.12.0
 commonsIOVersion=2.11.0
 commonsConfigurationVersion=2.9.0
 dropwizardMetricsVersion=4.2.25
-# FIXME: known binary incompatible lib brought in by Spark
+# Caution: fabric8 version should be aligned with Spark dependency
 fabric8Version=6.7.2
 lombokVersion=1.18.30
 operatorSDKVersion=4.7.0
 okHttpVersion=4.11.0
 # Spark
-sparkVersion=3.5.0
+sparkVersion=3.5.1
 sparkScalaVersion=2.12
 # Logging
 slf4jVersion=1.7.36
-log4jVersion=2.17.1
+log4jVersion=2.23.1
 log4jLayoutVersion=2.17.1
 # Test
 junitVersion=5.9.2

spark-operator/src/main/java/org/apache/spark/kubernetes/operator/probe/HealthProbe.java

@@ -85,7 +85,7 @@ public void handle(HttpExchange exchange) throws IOException {
   }
 
   private boolean checkInformersHealth(RuntimeInfo operatorRuntimeInfo) {
-    log.info("Checking informer health");
+    log.debug("Checking informer health");
     List<Boolean> informersHealthList = new ArrayList<>();
     for (var controllerEntry :
         operatorRuntimeInfo.unhealthyInformerWrappingEventSourceHealthIndicator()