Build warning: Ignoring deprecated java.level property

[basil]

Jenkins and plugins versions report

Environment

Paste the output here

What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 20.04.4 LTS x86_64

Reproduction steps

Run mvn clean verify -DskipTests as of HEAD (at the time of current writing, commit afa4de2).

Expected Results

The build completes with no warnings.

Actual Results

The build completes with the following warning:

[…]
[INFO] --- maven-hpi-plugin:3.27:validate (default-validate) @ commons-lang3-api ---
[WARNING] Ignoring deprecated java.level property. This property should be removed from your plugin's POM. In the future this warning will be changed to an error and will break the build.
[…]

Anything else?

Commit bb7726b was integrated without reading release notes: jenkinsci/plugin-pom#522. As the warning states, this property should be removed from the plugin's POM.

CC @nhojpatrick

[basil]

Fixed in #11.