ICU-23022 Update ICU data to TZDB 2025a.

[Yqwed]

Checklist

• Required: Issue filed: ICU-23022
• Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

[cjchapman]

@Yqwed I just talked with @DraganBesevic about this. He just merged a PR a few minutes ago for CLDR integration that updates the locale fallback data: #3356

Please rebase your PR.

[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• icu4c/source/common/localefallback_data.h is no longer changed in the branch
• icu4j/main/core/src/main/java/com/ibm/icu/impl/LocaleFallbackData.java is no longer changed in the branch

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[markusicu]

thank you!!