airframe-okhttp: Scala3 support prep. Remove Finagle from test dependency

[xerial]

• Remove Finagle from test
• TODO: Interface change airframe-http: Deprecate the legacy HttpClient[F[_], Req, Resp] interface #2440

[codecov]

Codecov Report

Merging #2670 (281d284) into master (7b7c3c7) will increase coverage by 0.13%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2670      +/-   ##
==========================================
+ Coverage   82.19%   82.33%   +0.13%     
==========================================
  Files         335      335              
  Lines       14047    14047              
  Branches     2241     2214      -27     
==========================================
+ Hits        11546    11565      +19     
+ Misses       2501     2482      -19     

Impacted Files	Coverage Δ
...vlet/airframe/http/netty/NetthRequestHandler.scala	77.55% <100.00%> (+16.32%)	⬆️
...main/scala/wvlet/airframe/http/ServerAddress.scala	96.00% <100.00%> (ø)
...rx/src/main/scala/wvlet/airframe/rx/RxRunner.scala	95.27% <0.00%> (+0.39%)	⬆️
...c/main/scala/wvlet/airframe/http/HttpMessage.scala	85.12% <0.00%> (+0.82%)	⬆️
...let/airframe/http/netty/NettyResponseHandler.scala	52.00% <0.00%> (+36.00%)	⬆️

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