Update Kotlin and Coroutines to 1.5

[heubeck]

Ready to go @jponge

[codecov]

Codecov Report

Merging #567 (02322f8) into main (f558abd) will increase coverage by 0.43%.
The diff coverage is 93.21%.

❗ Current head 02322f8 differs from pull request most recent head 858d2f5. Consider uploading reports for the commit 858d2f5 to get more accurate results

@@             Coverage Diff              @@
##               main     #567      +/-   ##
============================================
+ Coverage     89.83%   90.26%   +0.43%     
- Complexity     2990     3030      +40     
============================================
  Files           392      395       +3     
  Lines         11668    11829     +161     
  Branches       1459     1480      +21     
============================================
+ Hits          10482    10678     +196     
+ Misses          606      586      -20     
+ Partials        580      565      -15     

Impacted Files	Coverage Δ
...in/java/io/smallrye/mutiny/groups/MultiOnItem.java	100.00% <ø> (ø)
...io/smallrye/mutiny/groups/UniAndGroupIterable.java	100.00% <ø> (ø)
...c/main/java/io/smallrye/mutiny/math/Statistic.java	72.72% <ø> (ø)
...rye/mutiny/operators/multi/MultiSelectFirstOp.java	90.00% <66.66%> (+10.51%)	⬆️
...ye/mutiny/operators/uni/builders/UniJoinFirst.java	85.71% <85.71%> (ø)
...lrye/mutiny/operators/uni/builders/UniJoinAll.java	88.13% <88.13%> (ø)
...entation/src/main/java/io/smallrye/mutiny/Uni.java	96.66% <100.00%> (+0.37%)	⬆️
...c/main/java/io/smallrye/mutiny/groups/UniJoin.java	100.00% <100.00%> (ø)
...rc/main/java/io/smallrye/mutiny/groups/UniZip.java	100.00% <100.00%> (ø)
.../java/io/smallrye/mutiny/math/AverageOperator.java	100.00% <100.00%> (ø)
... and 35 more

[jponge]

All set, thanks a lot @heubeck 🙏