fix(@formatjs/intl-datetimeformat): hour off by one at the exact time…

… that DST starts or ends. (#2173)

e.g. for UK, DST starts at 01:00 UTC
When DST starts at 01:00 UTC, the correct local time is 02:00, not 01:00. There is no local time with hour equal to 1 that day.
When DST ends at 01:00 UTC, the correct local time is 01:00, not 02:00. The hour starting at 01:00 repeats.
Fix #2170

packages/ecma402-abstract/src/DateTimeFormat/ToLocalTime.ts

@@ -26,7 +26,7 @@ function getApplicableZoneData(
   let offset = 0;
   let dst = false;
   for (; i <= zoneData.length; i++) {
-    if (i === zoneData.length || zoneData[i][0] * 1e3 >= t) {
+    if (i === zoneData.length || zoneData[i][0] * 1e3 > t) {
       [, , offset, dst] = zoneData[i - 1];
       break;
     }