Support for Jetty 12 about javalin HOT 7 OPEN

@johanhaleby we discussed it, but ultimately decided against it because of the lack of a proper migration guide from Jetty. It's unclear how much work this is. Do you want to have a look at it?

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Oh, I didn't know this. There's a project in the JVM space that has "recipes" (or something similar) for automatically upgrading between different major versions of frameworks/libraries. Maybe they have a recipe for jetty? However, I don't remember the name of the project :)

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I was thinking of openrewrite, but I don't can't see that they have support for Jetty unfortunately.

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Unfortunately downgrading the jetty version also does not work for me anymore, as Spring Boot also references org.eclipse.jetty.io.Content - which has not been present in Jetty 11.
Unfortunately this now means that Javalin is blocking any further Spring Boot updates -.-

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By now there is also a migration guide: https://eclipse.dev/jetty/documentation/jetty-12/programming-guide/index.html#pg-migration-11-to-12

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Do you think you could submit a PR @klassm?

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Not sure - I just tried to do the upgrade, but I get stuck at the micrometer upgrade. I am not even sure whether that is currently possible, as there is no micrometer-jetty12 dependency available. There's also an open issue about jetty12 support...
micrometer-metrics/micrometer#4261

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