RFR: 8090: Enhancements for agent pom

[Brice Dutheil]

On Wed, 14 Jun 2023 08:19:56 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> This is the cleanup for JMC agent in the sense of #495.
> 
> It contains:
> - version bumps
> - URL updates
> - spotless integration

Marked as reviewed by bdutheil (Author).

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PR Review: https://git.openjdk.org/jmc/pull/496#pullrequestreview-1479034539