RFR: 8274407: (tz) Update Timezone Data to 2021c

[Naoto Sato]

On Wed, 6 Oct 2021 19:43:06 GMT, Sean Coffey <coffeys at openjdk.org> wrote:

>> This PR is to upgrade the time zone data in the JDK to IANA's tzdata2021c level. Note that the tz data is "as is", as released by IANA. No `merged links` are retracted.
>> The PR also fixes two issues along with the 2021c upgrade.
>
> pre-1970 data for some time zones is lost or becomes inaccurate with this tzdata release. Do we plan to release-note that point  ?

Good point, @coffeys. I'll make sure they are described in the release note.

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PR: https://git.openjdk.java.net/jdk/pull/5832