Make jetty-10/11 work against slf4j-api 1.7.30 in addition to 2.0.0

[janbartel]

jetty10/11

Currently, jetty builds against, and distributes slf4j-api version 2.0.0-alpha1. However, we have some users who need to run against the same slf4j version as older releases, which was slf4j-api 1.7.30.

We should modify the jetty-slf4j-logging implementation to also work against 1.7.30, build against 1.7.30, but distribute 2.0.0-alpha1 with jetty.home.

[janbartel]

@joakime comments?

[olamy]

@joakime our org.slf4j.spi.SLF4JServiceProvider implementation in a separate module?

[joakime]

I think this is doable on the jetty-slf4j-logging side.
Have to be careful with the jpms testing stuff though.

[github-actions]

This issue has been automatically marked as stale because it has been a
full year without activity. It will be closed if no further activity occurs.
Thank you for your contributions.

[sbordet]

Do we still need to support this?

[joakime]

No, just downgrading your slf4j-api version that you use with jetty is sufficient.
There's no code changes necessary.