Remove warning about Logbook bug

[msdousti]

The official documentation mentions a major bug for Logbook:

It refers to this issue on the Logbook project, which has been fixed by this PR, and integrated into Logbook 3.1.0 on May 19, 2023.

As such, I'd like to suggest removing this waning from the documentation. Thanks!

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[sdelamo]

Test def 'h2c do not upgrade fails after upgrading to the latest logbook. @yawkat could you check it out?

[yawkat]

ive merged 4.2.x and now the logbook test suite tests fail

[msdousti]

The h2c do not upgrade test is failing because of these lines:

https://github.com/micronaut-projects/micronaut-core/blob/0530ff704695dedee4d614f2e6cb2e055a6128dc/test-suite/src/test/groovy/io/micronaut/docs/netty/LogbookNettyServerCustomizerSpec.groovy#L338-L339

As explained in the description of the PR, with new Logbook version (3.1 onwards), this bug is resolved, so the "second" bar should now be visible in the logs. I'll adapt the test.

For some other reason, another test tls alpn http 2 started to fail after merging 4.2.x onto this branch. I bumbed Logbook version on 4.2.x itself and the test passed. ~~A bit strange...~~

PS The test tls alpn http 2 failed because of the @Requires added in 4fefb40. For the moment, "fixed" by removing it. Please see 6920568857a90b872e7c201f5c83497dd6970ada.