Fix JSON.ARRINDEX test

[dvora-h]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

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Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Base: 92.24% // Head: 92.22% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (17cd99a) compared to base (74c251a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2527      +/-   ##
==========================================
- Coverage   92.24%   92.22%   -0.02%     
==========================================
  Files         113      113              
  Lines       29357    29355       -2     
==========================================
- Hits        27079    27074       -5     
- Misses       2278     2281       +3     

Impacted Files	Coverage Δ
tests/test_json.py	100.00% <100.00%> (ø)
tests/test_asyncio/test_pubsub.py	99.37% <0.00%> (-0.16%)	⬇️
tests/test_cluster.py	97.01% <0.00%> (-0.12%)	⬇️

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