Configure CI to run the build with Java 15 and 16 (EA).

[cescoffier]

No description provided.

[codecov]

Codecov Report

Merging #505 (8895054) into main (adadf52) will increase coverage by 0.39%.
The diff coverage is n/a.

❗ Current head 8895054 differs from pull request most recent head 72a5727. Consider uploading reports for the commit 72a5727 to get more accurate results

@@             Coverage Diff              @@
##               main     #505      +/-   ##
============================================
+ Coverage     89.85%   90.25%   +0.39%     
- Complexity     2995     3018      +23     
============================================
  Files           382      382              
  Lines         11592    11592              
  Branches       1445     1447       +2     
============================================
+ Hits          10416    10462      +46     
+ Misses          606      573      -33     
+ Partials        570      557      -13     

Impacted Files	Coverage Δ	Complexity Δ
...ava/io/smallrye/mutiny/helpers/HalfSerializer.java	77.77% <0.00%> (-11.12%)	8.00% <0.00%> (-1.00%)
...mallrye/mutiny/operators/multi/MultiFlatMapOp.java	85.98% <0.00%> (ø)	3.00% <0.00%> (ø%)
...mallrye/mutiny/helpers/queues/MpscLinkedQueue.java	100.00% <0.00%> (+1.61%)	31.00% <0.00%> (+2.00%)
...io/smallrye/mutiny/operators/uni/UniMemoizeOp.java	95.04% <0.00%> (+1.98%)	28.00% <0.00%> (+1.00%)
...subscription/SwitchableSubscriptionSubscriber.java	97.54% <0.00%> (+2.45%)	46.00% <0.00%> (+1.00%)
...erators/multi/builders/SerializedMultiEmitter.java	83.54% <0.00%> (+2.53%)	27.00% <0.00%> (+2.00%)
...mallrye/mutiny/operators/multi/FlatMapManager.java	98.61% <0.00%> (+2.77%)	20.00% <0.00%> (+1.00%)
...lrye/mutiny/subscription/SerializedSubscriber.java	90.56% <0.00%> (+2.83%)	28.00% <0.00%> (+1.00%)
...java/io/smallrye/mutiny/helpers/Subscriptions.java	81.21% <0.00%> (+3.86%)	49.00% <0.00%> (+3.00%)
...iny/operators/multi/builders/BaseMultiEmitter.java	87.50% <0.00%> (+4.16%)	21.00% <0.00%> (+1.00%)
... and 2 more