3.x: Allow reruns of release actions by enabling bintray.override

[akarnokd]

By default, the bintray plugin only uploads a particular release version once. However, if the maven release fails afterwards, re-running the GitHub Action (GHA) would now fail with duplicate release error.

This setting of the bintray plugin allows overriding existing releases thus the GHA could be rerun and hopefully succeed next time.

Note to test this, a release or pre-release has to be issued so the next release for RxJava has to do release-candidates (RC1,...) first.

[codecov]

Codecov Report

Merging #7176 (705f45b) into 3.x (4d325c6) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7176      +/-   ##
============================================
- Coverage     99.53%   99.53%   -0.01%     
- Complexity     6751     6752       +1     
============================================
  Files           747      747              
  Lines         47350    47350              
  Branches       6367     6367              
============================================
- Hits          47131    47129       -2     
- Misses           97      100       +3     
+ Partials        122      121       -1     

Impacted Files	Coverage Δ	Complexity Δ
...erators/completable/CompletableConcatIterable.java	95.91% <0.00%> (-4.09%)	2.00% <0.00%> (ø%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	94.81% <0.00%> (-3.11%)	2.00% <0.00%> (ø%)
...eactivex/rxjava3/processors/BehaviorProcessor.java	97.48% <0.00%> (-2.52%)	50.00% <0.00%> (ø%)
...reactivex/rxjava3/processors/PublishProcessor.java	98.16% <0.00%> (-1.84%)	41.00% <0.00%> (-1.00%)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	96.33% <0.00%> (-1.84%)	2.00% <0.00%> (ø%)
...rnal/operators/flowable/FlowableFlatMapSingle.java	93.60% <0.00%> (-1.75%)	2.00% <0.00%> (ø%)
...ternal/operators/observable/ObservableFlatMap.java	97.87% <0.00%> (-0.36%)	3.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableReplay.java	99.78% <0.00%> (+0.21%)	21.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableCreate.java	99.35% <0.00%> (+0.32%)	6.00% <0.00%> (ø%)
...ternal/operators/observable/ObservableGroupBy.java	100.00% <0.00%> (+0.54%)	2.00% <0.00%> (ø%)
... and 8 more

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