8388214: (tz) Update Timezone Data to 2026c

[jerboaa]

Almost clean backport of the TZ data changes for 2026c. The only difference to JDK 28 is in the copyright (TestZoneRules.java) and in the "bug" lines in TestZoneTextPrinterParser.java. The latter is because CLDR 48 and CLDR 48.2 changes are not in JDK 25, but only some relevant and needed cherry-picks have been done. See dependent PRs.

Testing:

• test/jdk/sun/util/resources, test/jdk/java/time/test and test/jdk/java/util/TimeZone tests on Linux x86_64. One failure in TestZoneTextPrinterParser.java which is tracked for JDK head in JDK-8391256. I'll backport the fix in a follow-up.
• GHA

Thoughts?

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8388214 needs maintainer approval

Integration blocker

 ⚠️ Dependency #767 must be integrated first

Issue

• JDK-8388214: (tz) Update Timezone Data to 2026c (Enhancement - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/768/head:pull/768
$ git checkout pull/768

Update a local copy of the PR:
$ git checkout pull/768
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/768/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 768

View PR using the GUI difftool:
$ git pr show -t 768

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/768.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back sgehwolf! A progress list of the required criteria for merging this PR into pr/767 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (d511b320)