RFR: 2317: Avoid use of deprecated Thread.getId()

[Zhao Song]

On Fri, 5 Jul 2024 10:07:11 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> `Thread.getId()` was deprecated in JDK 19, as part of [JDK-8284161]. Skara build now produces warnings because of that method:
> 
>     Task :bot:compileTestJava
>     Note: skara/bot/src/test/java/org/openjdk/skara/bot/BotTaskAggregationHandlerTests.java uses or overrides a deprecated API.
> 
> [JDK-8284161]: https://bugs.openjdk.org/browse/JDK-8284161

Marked as reviewed by zsong (Reviewer).

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PR Review: https://git.openjdk.org/skara/pull/1669#pullrequestreview-2160963499