fix(core): Serialize dates and regexps when reading from augmented objects (#6086)

https://community.n8n.io/t/workflows-fail-when-triggered-but-succeed-when-run-manually/25575

packages/workflow/test/AugmentObject.test.ts

@@ -233,8 +233,8 @@ describe('AugmentObject', () => {
 				a: 9111,
 				b: '9222',
 				c: 3,
-				d: date,
-				r: regexp,
+				d: date.toJSON(),
+				r: regexp.toString(),
 			});
 		});