Fix alert schema

Author: ar2rsawseen

.github/GITHUB_ACTIONS.md

@@ -66,7 +66,14 @@ export const createAlertToolDefinition = {
             description: 'Optional filter key. For crashes: "App Version". For events: custom segment name. For rating: "Rating". For nps: "NPS scale". Set to null if no filter' 
           },
           filterValue: { 
-            type: ['string', 'array', 'null'], 
+            oneOf: [
+              { type: "string" },
+              {  
+                type: "array",
+                items: { type: "string" }
+              },
+              { type: "null" }
+            ],
             description: 'Optional filter value. For crashes: array of version strings (e.g. ["22:02:0"]). For rating: array of numbers 1-5. For nps: "detractor"/"passive"/"promoter". For events: string value. Set to null if no filter' 
           },
           alertBy: {