[jdk25u] Integrated: 8361950: Update to use jtreg 8

[Aleksey Shipilev]

On Mon, 6 Oct 2025 15:29:15 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Upgrading jtreg to 8 to match mainline. It is a separate commit, so that we can backout jtreg 8 upgrade separately, if we need.
> 
> Additional testing:
>  - [x] GHA
>  - [x] Linux AArch64 server fastdebug, `all` with jtreg-8+2

This pull request has now been integrated.

Changeset: 9df689f1
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk25u/commit/9df689f143e43d92bb5d281985ce9c5c514f8803
Stats:     41 lines in 11 files changed: 9 ins; 19 del; 13 mod

8361950: Update to use jtreg 8

Backport-of: 5db1dfe5c8b5df40779bb450849e6433aa9825ab

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PR: https://git.openjdk.org/jdk25u/pull/269