RFR: 7904053: Update version to 8.0 [v3]

Wed Jul 2 11:59:52 UTC 2025

On Wed, 2 Jul 2025 11:31:50 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this trivial change updating the version to `8.0`; the upcoming release version of jtreg.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update make/build-support/version-numbers

Marked as reviewed by jpai (Reviewer).

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PR Review: https://git.openjdk.org/jtreg/pull/271#pullrequestreview-2978861619