2.x: Added missing @NonNull attribute to Function7.

[alexandre-dubois]

This Pull Request adds the missing @nonnull attribute to Function7. On Pull Request #5023, Function7 was missing from the updates.

[codecov]

Codecov Report

Merging #5102 into 2.x will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5102      +/-   ##
============================================
+ Coverage     95.61%   95.65%   +0.04%     
- Complexity     5554     5557       +3     
============================================
  Files           615      615              
  Lines         39685    39685              
  Branches       5578     5578              
============================================
+ Hits          37944    37960      +16     
+ Misses          757      752       -5     
+ Partials        984      973      -11

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/reactivex/subjects/BehaviorSubject.java	84.97% <ø> (-5.7%)	56% <ø> (ø)
...rnal/subscribers/SinglePostCompleteSubscriber.java	94.87% <ø> (-5.13%)	14% <ø> (-1%)
...reactivex/internal/operators/maybe/MaybeUsing.java	95.95% <ø> (-4.05%)	4% <ø> (ø)
...vex/internal/operators/flowable/FlowableTimer.java	92.85% <ø> (-3.58%)	2% <ø> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	93.4% <ø> (-3.3%)	2% <ø> (ø)
.../operators/observable/ObservableFlatMapSingle.java	93.28% <ø> (-2.99%)	2% <ø> (ø)
...activex/internal/operators/single/SingleCache.java	97.05% <ø> (-2.95%)	23% <ø> (-1%)
...ternal/operators/completable/CompletableUsing.java	95.23% <ø> (-2.39%)	4% <ø> (ø)
...operators/observable/ObservableConcatMapEager.java	97.29% <ø> (-2.17%)	2% <ø> (ø)
.../main/java/io/reactivex/subjects/AsyncSubject.java	97.41% <ø> (-1.73%)	55% <ø> (-1%)
... and 33 more

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