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

[Sean Coffey]

On Wed, 6 Oct 2021 01:24:49 GMT, Naoto Sato <naoto 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.

Marked as reviewed by coffeys (Reviewer).

pre-1970 data for some time zones is lost or becomes inaccurate with this tzdata release. Do we plan to release-note that point  ?

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