Integrated: Update maven.yaml

[Leonid Kuskov]

On Mon, 12 May 2025 20:44:16 GMT, Leonid Kuskov <lkuskov at openjdk.org> wrote:

> Update maven.yaml - bump up the JDK version to 21

This pull request has now been integrated.

Changeset: 5ab39dcc
Author:    Leonid Kuskov <lkuskov at openjdk.org>
URL:       https://git.openjdk.org/asmtools/commit/5ab39dccc16fbc10c636f155787d6f55b5bd8df6
Stats:     3 lines in 1 file changed: 0 ins; 2 del; 1 mod

Update maven.yaml

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PR: https://git.openjdk.org/asmtools/pull/77