[SPARK-53510] Update SparkClusterResourceSpec to use apache/spark:4.0.1 as the default value of container image

### What changes were proposed in this pull request?

This PR aims to update `SparkClusterResourceSpec` to use `apache/spark:4.0.1` as the default value of container image.

### Why are the changes needed?

Since Apache Spark 4.0.1 image is published, we had better use this bug fixed version.

### Does this PR introduce _any_ user-facing change?

Yes if the user didn't specify the container image for Spark Cluster, but this is an expected change in that case.

### How was this patch tested?

Pass the CIs.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#311 from dongjoon-hyun/SPARK-53510.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

spark-submission-worker/src/main/java/org/apache/spark/k8s/operator/SparkClusterResourceSpec.java

@@ -59,7 +59,7 @@ public SparkClusterResourceSpec(SparkCluster cluster, SparkConf conf) {
     String clusterName = cluster.getMetadata().getName();
     String scheduler = conf.get(Config.KUBERNETES_SCHEDULER_NAME().key(), "default-scheduler");
     String namespace = conf.get(Config.KUBERNETES_NAMESPACE().key(), clusterNamespace);
-    String image = conf.get(Config.CONTAINER_IMAGE().key(), "apache/spark:4.0.0");
+    String image = conf.get(Config.CONTAINER_IMAGE().key(), "apache/spark:4.0.1");
     ClusterSpec spec = cluster.getSpec();
     String version = spec.getRuntimeVersions().getSparkVersion();
     StringBuilder options = new StringBuilder();