RFR: 8035: Update Java version in GHA workflow to 11.0.18

[Brice Dutheil]

On Fri, 17 Feb 2023 11:12:03 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> We can bump the GHA JDK to 11.0.18.

Marked as reviewed by bdutheil (Author).

-------------

PR: https://git.openjdk.org/jmc/pull/465