RFR: 8319192: Remove javax.swing.plaf.synth.SynthLookAndFeel.load(URL url) [v2]

[Phil Race]

> Back in JDK 21 we deprecated-for-removal SynthLookAndFeel.load(URL) and targeted it to be removed under this bug ID in JDK 25 .. which is now here.
> 
> No open tests needed to be updated to accommodate this removal 
> I did find one closed manual test, written to explicitly test this API back when it was added, and I'll need to remove that, but it doesn't affect this PR.
> 
> There will be a CSR (and probably a release note too).

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8319192

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23909/files
  - new: https://git.openjdk.org/jdk/pull/23909/files/bd7549bf..6656254c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23909&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23909&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23909.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23909/head:pull/23909

PR: https://git.openjdk.org/jdk/pull/23909