gluonhq/setup-graalvm causes warning because it is using node12 instead of node16

[beatngu13]

gluonhq/setup-graalvm doesn't provide an issue tracker, so I hope this is the right place.

At the moment, the Action causes the following warning because it is using node12 instead of node16:

The following actions uses node12 which is deprecated and will be forced to run on node16: gluonhq/setup-graalvm@6eecc74f9ad1f028b863d7a494e351668a1b0370. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

There is already an update PR available:

https://github.com/gluonhq/setup-graalvm/pull/6