Integrated: 8325093: Update CONTRIBUTING.md for build jdk version

[Ao Qi]

On Thu, 1 Feb 2024 06:36:51 GMT, Ao Qi <aoqi at openjdk.org> wrote:

> [JDK-8297068](https://bugs.openjdk.org/browse/JDK-8297068) updated boot JDK to 19.0.1 from 18.0.2, and [JDK-8321434](https://bugs.openjdk.org/browse/JDK-8321434) updated boot JDK to 21.0.1. `CONTRIBUTING.md` should be updated correspondingly.

This pull request has now been integrated.

Changeset: 12816b57
Author:    Ao Qi <aoqi at openjdk.org>
Committer: Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.org/jfx/commit/12816b57ffd1ffad57d008f7195666ad4e9400bb
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

8325093: Update CONTRIBUTING.md for build jdk version

Reviewed-by: kcr

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PR: https://git.openjdk.org/jfx/pull/1357