Update Event Grid CODEOWNERS to assign @Kishp01 @shankarsama @rajeshka (#45803)

Author: Copilot

.github/CODEOWNERS

@@ -458,8 +458,8 @@
 /sdk/eventgrid/                                      @samvaity @srnagar @lmolkova @Azure/azure-java-sdk
 
 # ServiceLabel: %Event Grid
-# AzureSdkOwners:                                    @samvaity
-# ServiceOwners:                                     @Kishp01 @ahamad-MS
+# AzureSdkOwners:                                    @Kishp01 @shankarsama @rajeshka
+# ServiceOwners:                                     @Kishp01 @shankarsama @rajeshka
 
 # PRLabel: %Event Hubs
 /sdk/eventhubs/                                      @conniey @anuchandy @lmolkova @Azure/azure-java-sdk