airframe-config: Scala 3 support

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #2205 (36761e6) into master (c273423) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2205   +/-   ##
=======================================
  Coverage   82.62%   82.63%           
=======================================
  Files         313      313           
  Lines       12348    12350    +2     
  Branches      781      780    -1     
=======================================
+ Hits        10203    10205    +2     
  Misses       2145     2145           

Impacted Files	Coverage Δ
.../src/main/scala/wvlet/airframe/config/Config.scala	98.03% <100.00%> (+0.01%)	⬆️
.../main/scala/wvlet/airframe/config/YamlReader.scala	80.32% <100.00%> (+0.32%)	⬆️
...src/main/scala/wvlet/airframe/config/package.scala	96.00% <100.00%> (ø)

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