Improved code by updating any interfaces

Change-Id: I9a2e630c37f3c427569f5bbd773978c2705dc08c
diff --git a/cmd/korap-mcp/main.go b/cmd/korap-mcp/main.go
index 2b67475..d908f10 100644
--- a/cmd/korap-mcp/main.go
+++ b/cmd/korap-mcp/main.go
@@ -37,10 +37,10 @@
 	err = server.AddTool(
 		"ping",
 		"Simple ping tool to test server connectivity",
-		map[string]interface{}{
+		map[string]any{
 			"type": "object",
-			"properties": map[string]interface{}{
-				"message": map[string]interface{}{
+			"properties": map[string]any{
+				"message": map[string]any{
 					"type":        "string",
 					"description": "Message to echo back",
 				},