Change a method name to make consistent with PR#6801

[T45K]

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In #6801, a method name, FlowableZipIterable#error is changed to fail, but its similar class, ObservableZipIterable was not changed.
I changed it for consistency.

• Please include the issue list number(s) or other PR numbers in the description if you are contributing in response to those.

This PR is related to #6801

• Please include a reasonable set of unit tests if you contribute new code or change an existing one. If you contribute an operator, (if applicable) please make sure you have tests for working with an empty, just, range of values as well as an error source, with and/or without backpressure and see if unsubscription/cancellation propagates correctly.

This change will not affect external behavior.

[codecov]

Codecov Report

Merging #7080 into 3.x will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@ Coverage Diff @@## 3.x #7080 +/- ##
============================================
- Coverage 99.51% 99.49% -0.02% 
Complexity 6667 6667 ============================================
Files 742 742 Lines 47275 47275 Branches 6374 6374 ============================================
- Hits 47044 47037 -7 - Misses 105 110 +5 - Partials 126 128 +2 

Impacted Files	Coverage Δ	Complexity Δ
...al/operators/observable/ObservableZipIterable.java	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
.../operators/observable/ObservableFlatMapSingle.java	94.44% <0.00%> (-3.18%)	2.00% <0.00%> (ø%)
...va/io/reactivex/rxjava3/subjects/MaybeSubject.java	97.75% <0.00%> (-2.25%)	45.00% <0.00%> (-1.00%)
.../internal/disposables/ListCompositeDisposable.java	98.00% <0.00%> (-2.00%)	34.00% <0.00%> (-1.00%)
...tivex/rxjava3/disposables/CompositeDisposable.java	98.14% <0.00%> (-1.86%)	39.00% <0.00%> (-1.00%)
...internal/operators/flowable/FlowableFromArray.java	96.61% <0.00%> (-1.70%)	3.00% <0.00%> (ø%)
...java3/internal/operators/flowable/FlowableZip.java	98.97% <0.00%> (-1.03%)	6.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableCreate.java	98.05% <0.00%> (-0.98%)	6.00% <0.00%> (ø%)
...operators/observable/ObservableMergeWithMaybe.java	99.09% <0.00%> (-0.91%)	2.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableReplay.java	98.92% <0.00%> (-0.86%)	21.00% <0.00%> (ø%)
... and 11 more

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