Integrated: 7861: Bump Agent build to Java 11 compliance and cleanup POM

[Christoph Langer]

On Wed, 27 Jul 2022 11:21:45 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> The JMC Agent project is set up in a somewhat awkward way at the moment. The maven.compiler.source and maven.compiler.target properties are set to 1.8 but we enforce a JDK 11 during the build and also have a test case that implicitly uses/tests JDK11 features. Maybe it is time now to bump the agent to Java 11 compliance?
> 
> Furthermore, the POM file could be cleaned up and a few maven plugins that are used could be bumped to more recent versions.

This pull request has now been integrated.

Changeset: bd35870e
Author:    Christoph Langer <clanger at openjdk.org>
URL:       https://git.openjdk.org/jmc/commit/bd35870e44a7260bb017826d97ac8cfc03b0c111
Stats:     234 lines in 3 files changed: 87 ins; 107 del; 40 mod

7861: Bump Agent build to Java 11 compliance and cleanup POM

Reviewed-by: hirt

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PR: https://git.openjdk.org/jmc/pull/415