Switch from Java9 to Java11 build and adapt dependencies

[simonbasle]

No description provided.

[codecov-io]

Codecov Report

Merging #1407 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1407      +/-   ##
============================================
+ Coverage     84.09%   84.09%   +<.01%     
+ Complexity     3873     3870       -3     
============================================
  Files           357      357              
  Lines         29387    29337      -50     
  Branches       5452     5452              
============================================
- Hits          24712    24670      -42     
+ Misses         3068     3066       -2     
+ Partials       1607     1601       -6

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/reactor/core/publisher/FluxEmpty.java	83.33% <0%> (-4.17%)	4% <0%> (-1%)
...va/reactor/core/publisher/ParallelMergeReduce.java	68.59% <0%> (-3.31%)	3% <0%> (ø)
...in/java/reactor/core/publisher/FluxWindowWhen.java	81.73% <0%> (-2.89%)	2% <0%> (ø)
...ain/java/reactor/util/concurrent/WaitStrategy.java	50.42% <0%> (-2.42%)	11% <0%> (ø)
...ava/reactor/core/scheduler/ImmediateScheduler.java	76.19% <0%> (-2.08%)	6% <0%> (-1%)
.../reactor/core/scheduler/PeriodicSchedulerTask.java	54.83% <0%> (-1.42%)	7% <0%> (ø)
...in/java/reactor/core/publisher/BaseSubscriber.java	79.36% <0%> (-0.94%)	18% <0%> (ø)
...ain/java/reactor/core/scheduler/SchedulerTask.java	68.42% <0%> (-0.81%)	12% <0%> (ø)
...ava/reactor/core/scheduler/PeriodicWorkerTask.java	70.73% <0%> (-0.7%)	12% <0%> (ø)
...c/main/java/reactor/core/publisher/MonoCreate.java	75.67% <0%> (-0.65%)	2% <0%> (ø)
... and 25 more

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