Update `JarWriter` so that entry times are set with the default TimeZone
offset removed. The Javadoc for `ZipEntry.setTime` states:
The file entry is "encoded in standard `MS-DOS date and time format`.
The default TimeZone is used to convert the epoch time to the MS-DOS
data and time.
Removing the offset from our UTC time before calling `entry.setTime()`
ensures that we get consistent bytes in the zip file when the output
stream reapplies the offset during write.
Fixes gh-34424
998d59b7ac