fix: type hint of PySparkProcessor __init__

[NivekNey]

Description of changes:

Currently the signature type instance_type and instance_count of the PySparkProcessor.__init__ is wrong.

sagemaker-python-sdk/src/sagemaker/spark/processing.py

Lines 683 to 684 in 284ddbe

	instance_type: Union[int, PipelineVariable],
	instance_count: Union[str, PipelineVariable],

Testing done:

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[codecov-commenter]

Codecov Report

Merging #3297 (284ddbe) into master (284ddbe) will not change coverage.
The diff coverage is n/a.

❗ Current head 284ddbe differs from pull request most recent head d222eb9. Consider uploading reports for the commit d222eb9 to get more accurate results

@@           Coverage Diff           @@
##           master    #3297   +/-   ##
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  Coverage   89.82%   89.82%           
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  Files         645      645           
  Lines       55518    55518           
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  Hits        49871    49871           
  Misses       5647     5647           

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