RFR: 8294695: Remove redundant deprecation suppression in ThreadGroup

[Alan Bateman]

On Sat, 1 Oct 2022 16:17:58 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> This suppression were added with Loom integration, but method `Thread.getThreadGroup()` is not deprecated.
> Let's cleanup code a bit.
> https://mail.openjdk.org/pipermail/core-libs-dev/2022-September/094907.html

Marked as reviewed by alanb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10521