Upgrade to Gradle 7.4

[akarnokd]

Via

gradlew wrapper --gradle-version=7.4

[codecov]

Codecov Report

Merging #7392 (31ebd84) into 3.x (47189ac) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7392      +/-   ##
============================================
+ Coverage     99.52%   99.54%   +0.01%     
- Complexity     6780     6782       +2     
============================================
  Files           751      751              
  Lines         47482    47482              
  Branches       6378     6378              
============================================
+ Hits          47255    47264       +9     
+ Misses          103      101       -2     
+ Partials        124      117       -7     

Impacted Files	Coverage Δ
...nternal/operators/observable/ObservableCreate.java	95.72% <0.00%> (-3.42%)	⬇️
...va/io/reactivex/rxjava3/subjects/AsyncSubject.java	97.87% <0.00%> (-2.13%)	⬇️
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	96.33% <0.00%> (-1.84%)	⬇️
...nternal/operators/parallel/ParallelSortedJoin.java	98.49% <0.00%> (-1.51%)	⬇️
...ternal/operators/observable/ObservableFlatMap.java	97.87% <0.00%> (-0.71%)	⬇️
...a/io/reactivex/rxjava3/subjects/ReplaySubject.java	98.75% <0.00%> (-0.42%)	⬇️
...3/internal/operators/flowable/FlowableFlatMap.java	98.88% <0.00%> (-0.28%)	⬇️
...a3/internal/operators/flowable/FlowableCreate.java	99.35% <0.00%> (+0.32%)	⬆️
...operators/flowable/FlowableConcatMapScheduler.java	99.60% <0.00%> (+0.39%)	⬆️
.../operators/maybe/MaybeFlatMapIterableFlowable.java	100.00% <0.00%> (+0.81%)	⬆️
... and 9 more

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