test(message-parser): remove duplicate timestamp cases

Author: Shreyas2004wagh

packages/message-parser/tests/timestamp.test.ts

@@ -40,8 +40,6 @@ test.each([
 });
 
 test.each([
-	['<t:2025-07-22T10:00:00.000+00:00:R>', [paragraph([timestampNode('1753178400', 'R')])]],
-	['<t:2025-07-22T10:00:00.000+00:00:R>', [paragraph([timestampNode('1753178400', 'R')])]],
 	['<t:2025-07-22T10:00:00.000+00:00:R>', [paragraph([timestampNode('1753178400', 'R')])]],
 	['<t:2025-07-22T10:00:00+00:00:R>', [paragraph([timestampNode('1753178400', 'R')])]],