AirSpec: Prepare Scala3 compat layer for AirSpec

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #1658 (5259817) into master (79fd025) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1658   +/-   ##
=======================================
  Coverage   83.11%   83.12%           
=======================================
  Files         312      312           
  Lines       12503    12497    -6     
  Branches      777      777           
=======================================
- Hits        10392    10388    -4     
+ Misses       2111     2109    -2     

Impacted Files	Coverage Δ
airspec/src/main/scala/wvlet/airspec/AirSpec.scala	95.00% <ø> (-0.66%)	⬇️
...src/main/scala/wvlet/airspec/AirSpecLauncher.scala	100.00% <ø> (ø)
...cala/wvlet/airspec/runner/AirSpecContextImpl.scala	100.00% <ø> (ø)
.../main/scala/wvlet/airspec/spi/AirSpecContext.scala	100.00% <ø> (ø)
...rx/src/main/scala/wvlet/airframe/rx/RxRunner.scala	91.66% <0.00%> (+0.87%)	⬆️

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