RFR: 8296246: Update Unicode Data Files to Version 15.1.0 [v5]

Tue Sep 19 18:55:49 UTC 2023

On Tue, 19 Sep 2023 18:55:28 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This PR is to incorporate the latest Unicode 15.1, which was released yesterday. Besides the usual character data update, an upgraded implementation of RegEx which reflects the Indic Conjunct Break specified in the latest [Unicode Annex #29 ("Unicode Text Segmentation")](https://unicode.org/reports/tr29/) is included. A corresponding CSR has also been drafted.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Reflecting review comments

Marked as reviewed by srl (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/15728#pullrequestreview-1633987334