Jetty 12 upgrade

[gaul]

Jetty 11 reached end of community support earlier this year: https://jetty.org/download.html. Unfortunately Jetty 12 requires Java 17 so this may cause some user pain.

[keos05]

There also now exists a first minor security issue with Jetty 11 - CVE-2024-6763
Which will not be fixed anymore in Jetty 11.

[ryanfaircloth]

Bumping this one up, Java 11 and Jetty EOLs will be red flags. I took a crack at using co-pilot and Amazon Q for these PRs but they are beyond my skillset and it didn't go well