RFR: 7413: Fix building JMC with Docker

[Marcus Hirt]

On Sat, 2 Oct 2021 08:20:29 GMT, Christoph Dreis <github.com+6304496+dreis2211 at openjdk.org> wrote:

> Hi,
> 
> I noticed that the Docker builds still point to JDK 8 and thus fail with messages like the following.
> 
> 
> Caused by: java.lang.UnsupportedClassVersionError: org/eclipse/tycho/core/maven/TychoMavenLifecycleParticipant has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
> 
> 
> This PR therefore upgrades the Docker images to newer JDK 11 images, which fixes the issues described.
> 
> This would need a ticket in the bug tracker and I hope you can create this for me. OCA should be signed already, but let me know if I need to confirm something again.
> 
> In case you think this is worthwhile, I would appreciate it if this is sponsored.
> 
> Cheers,
> Christoph

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/317