fix: type annotation of helper function

[harkal]

What I did

Fixed the signature of _append_return_for_stack_operand() to take the context not the basic block

How I did it

How to verify it

Commit message

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Description for the changelog

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[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b0ea5b6) 83.98% compared to head (4e43d5c) 83.69%.

Files	Patch %	Lines
vyper/venom/ir_node_to_venom.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3702      +/-   ##
==========================================
- Coverage   83.98%   83.69%   -0.30%     
==========================================
  Files          92       92              
  Lines       13046    13047       +1     
  Branches     2928     2928              
==========================================
- Hits        10957    10920      -37     
- Misses       1657     1693      +36     
- Partials      432      434       +2     

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