Update splunk/splunk Docker tag to v9.2.2

splunk/deployment.yaml

@@ -17,7 +17,7 @@ spec:
         app: splunk
     spec:
       containers:
-      - image: splunk/splunk:9.0.4@sha256:393160e2cc34eaf8ba2de279211ebd9c7a32b8d9fdbc81680988aa7aef35ef41
+      - image: splunk/splunk:9.2.2@sha256:c7208b641cdc2042d8355b754cd7f9a7a3b9feb0ffefecdb2714c816e7d33cfc
         name: splunk
         env:
         - name: SPLUNK_START_ARGS