[jfx17u] RFR: 8289541: Update ICU4C to 71.1

[Kevin Rushforth]

Clean backport. CI build run on all three platforms.

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Commit messages:
 - 8289541: Update ICU4C to 71.1

Changes: https://git.openjdk.org/jfx17u/pull/92/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=92&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289541
  Stats: 144949 lines in 751 files changed: 10988 ins; 123549 del; 10412 mod
  Patch: https://git.openjdk.org/jfx17u/pull/92.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/92/head:pull/92

PR: https://git.openjdk.org/jfx17u/pull/92