Upgrade to Jetty 9.4.48.v20220622

[snicoll]

Supersedes #31489

[joakime]

Be aware of Community End of Life for Jetty 9.4.x

• EOL (End of Life) for Jetty 9 - January 2025 jetty/jetty.project#7958

[philwebb]

Thanks @joakime, I think we stuck to Jetty 9 for JDK 8 compatibility, but we do test against Jetty 10 to ensure folks can upgrade if they want to.

For Spring Boot 3 we're depending on Jetty 11.