Update parseISO.baseline for PR #4318

PR #4318 updates how Date.parse handles padded years, but parseISO.baseline
wasn't updated to reflect this change, causing some test failures.

test/Date/parseISO.baseline

@@ -7803,8 +7803,8 @@ Invalid Date
 Invalid Date
 
 0001-01-01Z
-2001-01-01T00:00:00.000Z
-978307200000 === 978307200000
+0001-01-01T00:00:00.000Z
+-62135596800000 === -62135596800000
 
 // Optionality of minutes
 
@@ -7812,8 +7812,8 @@ Invalid Date
 Invalid Date
 
 0001-01-01T01:01:01.001+01
-2001-01-01T00:01:01.001Z
-978307261001 === 978307261001
+0001-01-01T00:01:01.001Z
+-62135596738999 === -62135596738999
 
 // Time-only forms