RFR: 8362291: [macOS] Remove finalize method in CGraphicsEnvironment.java

[Phil Race]

Remove a finalize() method in CGraphicsEnvironment, replacing it with Disposer.

I don't see a way to add a test to verify this clean up.

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Commit messages:
 - 8362291

Changes: https://git.openjdk.org/jdk/pull/26332/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26332&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362291
  Stats: 21 lines in 2 files changed: 12 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/26332.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26332/head:pull/26332

PR: https://git.openjdk.org/jdk/pull/26332