fix: swagger schema webhook test request payload type correction

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb-sdk/src/lib/Api.ts

@@ -1716,7 +1716,7 @@ export interface PluginReqType {
 export interface PluginTestReqType {
   /** Plugin Title */
   title: string;
-  /** Plugin Input */
+  /** Plugin Input as JSON string */
   input: string;
 }
 

packages/nocodb/src/schema/swagger.json

@@ -12728,9 +12728,16 @@
             "description": "Plugin Title"
           },
           "input": {
+            "oneOf": [
+              {
                 "type": "string",
+                "description": "Plugin Input as JSON string"
+              },
+              {
                 "description": "Plugin Input"
               }
+            ]
+          }
         },
         "required": ["title", "input"]
       },