Update Splunk Enterprise version from 10.0.0 to 10.2.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gabrielm-splunk

.env

@@ -8,4 +8,4 @@ EKSCTL_VERSION=v0.215.0
 EKS_CLUSTER_K8_VERSION=1.34
 EKS_INSTANCE_TYPE=m5.2xlarge
 EKS_INSTANCE_TYPE_ARM64=c6g.4xlarge
-SPLUNK_ENTERPRISE_RELEASE_IMAGE=splunk/splunk:10.0.0
+SPLUNK_ENTERPRISE_RELEASE_IMAGE=splunk/splunk:10.2.0