RFR: 8326618 : Replace usage of deprecated method getId() in Thread

[John Hendrikx]

On Tue, 27 Feb 2024 17:58:13 GMT, Anirvan Sarkar <asarkar at openjdk.org> wrote:

> Replace Thread.currentThread().getId() with Thread.currentThread().threadId()

Looks okay.  `threadId` was added in JDK 19, but since we're on 21 now that should be fine.

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Marked as reviewed by jhendrikx (Committer).

PR Review: https://git.openjdk.org/jfx/pull/1383#pullrequestreview-1904467291