Fix type annotation for AIOKafkaAdminClient.create_partitions

[alm0ra]

Fixes #977

Changes

Fixes wrong typo in create_partitions() for the admin client

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder

[alm0ra]

@tvoinarovskyi @ods

there is no documentation provided for AIOKafkaAdminClient so there is nothing to update and changes
also for test, there is a test for this part test_admin that satisfy this change

[alm0ra]

@ods All resolved i think it's ready

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9166c96) 95.11% compared to head (6cb1375) 95.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #978      +/-   ##
==========================================
- Coverage   95.11%   95.10%   -0.02%     
==========================================
  Files         107      107              
  Lines       16412    16413       +1     
  Branches     2625     2625              
==========================================
- Hits        15611    15610       -1     
- Misses        522      523       +1     
- Partials      279      280       +1     

Flag	Coverage Δ
cext	91.81% <100.00%> (-0.02%)	⬇️
integration	94.75% <100.00%> (+<0.01%)	⬆️
purepy	94.57% <100.00%> (-0.02%)	⬇️
unit	44.90% <100.00%> (-0.01%)	⬇️

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