airframe-jmx: Scala 3 support

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #2201 (bc556a9) into master (558e981) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2201   +/-   ##
=======================================
  Coverage   82.62%   82.62%           
=======================================
  Files         313      313           
  Lines       12357    12348    -9     
  Branches      780      781    +1     
=======================================
- Hits        10210    10203    -7     
+ Misses       2147     2145    -2     

Impacted Files	Coverage Δ
...x/src/main/scala/wvlet/airframe/jmx/JMXMBean.scala	65.57% <100.00%> (-1.57%)	⬇️
...rc/main/scala/wvlet/airframe/jmx/JMXRegistry.scala	88.88% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 558e981...bc556a9. Read the comment docs.