Fixing version tag on Schedulers.from(Executor, boolean)

[luis-cortes]

Resolves #6543

Updating the version tag on Schedulers.from(Executor, boolean) since it was promoted.

[codecov]

Codecov Report

Merging #6544 into 3.x will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #6544      +/-   ##
============================================
- Coverage     98.27%   98.22%   -0.06%     
+ Complexity     6205     6200       -5     
============================================
  Files           682      682              
  Lines         45459    45459              
  Branches       6288     6288              
============================================
- Hits          44675    44650      -25     
- Misses          256      266      +10     
- Partials        528      543      +15

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/schedulers/Schedulers.java	100% <ø> (ø)	11 <0> (ø)	⬇️
.../operators/observable/ObservableFlatMapSingle.java	88.8% <0%> (-5.98%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
...tivex/internal/observers/FutureSingleObserver.java	94.33% <0%> (-3.78%)	24% <0%> (-1%)
...activex/internal/observers/QueueDrainObserver.java	97.43% <0%> (-2.57%)	21% <0%> (-1%)
...ava/io/reactivex/processors/BehaviorProcessor.java	96.58% <0%> (-2.44%)	51% <0%> (ø)
...ernal/operators/flowable/FlowableFromIterable.java	95.18% <0%> (-2.14%)	5% <0%> (ø)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...tivex/internal/operators/single/SingleTimeout.java	98.33% <0%> (-1.67%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	94.02% <0%> (-1.64%)	2% <0%> (ø)
... and 16 more

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