RFR: 8308306: Update to Xcode 14.3 on macOS

Tue May 23 15:23:42 UTC 2023

Update the compiler on macOS to Xcode 14.3. In addition to providing the needed C++20 support for the next WebKit update, initial testing by the JDK team shows that this fixes a reproducible builds problem, so it might help address [JDK-8306886](https://bugs.openjdk.org/browse/JDK-8306886).

Xcode 14.3 requires macOS 13 Ventura to build (although it is known to build on macOS 12 Monterey, which might be useful for developer builds). The generated JavaFX code will run on older versions of macOS.

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Commit messages:
 - 8308306: Update to Xcode 14.3 on macOS

Changes: https://git.openjdk.org/jfx/pull/1140/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1140&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308306
  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1140.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1140/head:pull/1140

PR: https://git.openjdk.org/jfx/pull/1140