RFR: 8354875: Update to GCC 14.2.0 on Linux

[Kevin Rushforth]

This PR updates the compiler on Linux to GCC 14.2.0 (from 13.2.0) to match JDK 25.

I ran a full headless and headful test run, including building media and WebKit, on the following:

* [x] Oracle Linux 8 (our production build and headless test platform)
* [x] Ubuntu 16.04
* [x] Ubuntu 22.04
* [x] Ubuntu 24.04

-------------

Commit messages:
 - Merge branch 'master' into 8354875-gcc-14.2
 - Update GHA gcc compiler
 - 8354875: Update to GCC 14.2.0 on Linux

Changes: https://git.openjdk.org/jfx/pull/1784/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1784&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354875
  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1784.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1784/head:pull/1784

PR: https://git.openjdk.org/jfx/pull/1784