Migrate from Zod v3 to v4 (#14639)

Closes [#1526](https://github.com/twentyhq/core-team-issues/issues/1526)

---------

Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-front/src/modules/workflow/utils/parseAndValidateVariableFriendlyStringifiedJson.ts

@@ -1,9 +1,9 @@
 import { z } from 'zod';
 
 const schema = z
-  .record(z.any())
+  .record(z.string(), z.any())
   .refine((data) => Object.keys(data).every((key) => !key.match(/\s/)), {
-    message: 'JSON keys cannot contain spaces',
+    error: 'JSON keys cannot contain spaces',
   });
 
 export const parseAndValidateVariableFriendlyStringifiedJson = (