chore(implementation): use Jetty-12.1 core without servlets#333

lachlan-roberts wants to merge 7 commits intoGoogleCloudPlatform:mainGoogleCloudPlatform/functions-framework-java:mainfrom

webtide:jetty-12.1-no-servletswebtide/functions-framework-java:jetty-12.1-no-servletsCopy head branch name to clipboard