RFR: 8306329 : Update ICU4C to 73.1 [v4]

[Hima Bindu Meda]

> Updated ICU to v73.1. Verified build and sanity. No issues seen.

Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:

  Update preamble in LICENSE

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1138/files
  - new: https://git.openjdk.org/jfx/pull/1138/files/d96d239c..844a8fd4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1138&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1138&range=02-03

  Stats: 13 lines in 1 file changed: 13 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1138.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1138/head:pull/1138

PR: https://git.openjdk.org/jfx/pull/1138