3.x: Upgrade to Gradle 6.8.2

[akarnokd]

Upgrade Gradle.

[codecov]

Codecov Report

Merging #7184 (7c37954) into 3.x (4e86963) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7184      +/-   ##
============================================
- Coverage     99.56%   99.54%   -0.03%     
- Complexity     6752     6753       +1     
============================================
  Files           747      747              
  Lines         47350    47350              
  Branches       6367     6367              
============================================
- Hits          47146    47135      -11     
- Misses           93       96       +3     
- Partials        111      119       +8     

Impacted Files	Coverage Δ	Complexity Δ
...l/operators/observable/ObservableFlatMapMaybe.java	89.43% <0.00%> (-4.93%)	2.00% <0.00%> (ø%)
...rnal/operators/flowable/FlowableFlatMapSingle.java	94.18% <0.00%> (-3.49%)	2.00% <0.00%> (ø%)
...ternal/operators/completable/CompletableMerge.java	97.29% <0.00%> (-2.71%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	95.23% <0.00%> (-1.59%)	2.00% <0.00%> (ø%)
...nternal/operators/observable/ObservableCreate.java	98.29% <0.00%> (-0.86%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableCombineLatest.java	99.38% <0.00%> (-0.62%)	6.00% <0.00%> (ø%)
.../reactivex/rxjava3/processors/ReplayProcessor.java	99.19% <0.00%> (-0.41%)	52.00% <0.00%> (ø%)
...operators/flowable/FlowableConcatMapScheduler.java	99.20% <0.00%> (-0.40%)	4.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableCreate.java	99.35% <0.00%> (+0.32%)	6.00% <0.00%> (ø%)
...a/io/reactivex/rxjava3/subjects/ReplaySubject.java	99.58% <0.00%> (+0.41%)	49.00% <0.00%> (ø%)
... and 3 more

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