feat: upgrade zod to v4

Author: davidkna-sap

package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "orval": "^7.13.2",
-    "zod": "^3.25.76",
+    "zod": "^4.1.12",
     "@changesets/cli": "^2.29.7",
     "@jest/globals": "^30.2.0",
     "@sap-ai-sdk/ai-api": "workspace:^",

packages/orchestration/src/orchestration-client.test.ts

@@ -597,13 +597,12 @@ describe('orchestration service client', () => {
     ).toThrowErrorMatchingInlineSnapshot(`
      "Prompt Template YAML does not conform to the defined type. Validation errors: [
        {
-         "code": "invalid_type",
          "expected": "object",
-         "received": "undefined",
+         "code": "invalid_type",
          "path": [
            "spec"
          ],
-         "message": "Required"
+         "message": "Invalid input: expected object, received undefined"
        }
      ]"
     `);

packages/prompt-registry/package.json

@@ -31,6 +31,6 @@
   },
   "dependencies": {
     "@sap-ai-sdk/core": "workspace:^",
-    "zod": "^3.25.76"
+    "zod": "^4.1.12"
   }
 }