fix(datasource/packagist): Use serializable type for `availablePackages` (#23117)

lib/modules/datasource/packagist/index.ts

@@ -184,7 +184,10 @@ export class PackagistDatasource extends Datasource {
     try {
       const meta = await this.getRegistryMeta(registryUrl);
 
-      if (meta.availablePackages && !meta.availablePackages.has(packageName)) {
+      if (
+        meta.availablePackages &&
+        !meta.availablePackages.includes(packageName)
+      ) {
         return null;
       }
 

lib/modules/datasource/packagist/schema.ts

@@ -207,11 +207,7 @@ export const RegistryMeta = z
         ['providers-lazy-url']: z.string().nullable().catch(null),
         ['providers-url']: z.string().nullable().catch(null),
         ['metadata-url']: z.string().nullable().catch(null),
-        ['available-packages']: z
-          .array(z.string())
-          .transform((xs) => new Set(xs))
-          .nullable()
-          .catch(null),
+        ['available-packages']: z.array(z.string()).nullable().catch(null),
       })
     )
   )