deps: changes to armeria-brave6

[codefromthecrypt]

com.linecorp.armeria:armeria-brave now defaults to brave 5, which in the server is no problem as we imported the brave bom. however, to prevent accidents we should depend on the replacement com.linecorp.armeria:armeria-brave6

< [INFO] +- com.linecorp.armeria:armeria-brave:jar:1.27.1:compile
< [INFO] |  \- com.linecorp.armeria:armeria-brave5:jar:1.27.1:compile
< [INFO] |     \- io.zipkin.brave:brave-instrumentation-http:jar:6.0.0:compile
---
> [INFO] +- com.linecorp.armeria:armeria-brave6:jar:1.27.1:compile
> [INFO] |  \- io.zipkin.brave:brave-instrumentation-http:jar:6.0.0:compile

See line/armeria#5438 cc @openzipkin/armeria as if any of you are using instrumentation, you should make sure to change your deps similarly or get no free version updates from armeria anymore!