[readlines] replace io.TextIOWrapper(sys.stdin.buffer, encoding=utf-8) with sys.stdin

[ome9ax]

Objective

• Improve the input reader's efficiency

Proposed changes

• Simplify the way target reads stdin lines

Types of changes

What types of changes does your code introduce to target-s3-jsonl?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• Description above provides context of the change
• I have added tests that prove my fix is effective or that my feature works
• Unit tests for changes (not needed for documentation changes)
• CI checks pass with my changes
• Bumping version in setup.py is an individual PR and not mixed with feature or bugfix PRs
• Commits follow "How to write a good git commit message"
• Relevant documentation is updated including usage instructions

[codecov-commenter]

Codecov Report

Merging #13 (66e7bec) into main (3e76843) will increase coverage by 6.13%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   60.10%   66.23%   +6.13%     
==========================================
  Files           3        2       -1     
  Lines         198      154      -44     
  Branches       38       32       -6     
==========================================
- Hits          119      102      -17     
+ Misses         64       37      -27     
  Partials       15       15              

Flag	Coverage Δ
unittests	66.23% <61.53%> (+6.13%)	⬆️

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Impacted Files	Coverage Δ
target_s3_jsonl/__init__.py	64.86% <61.53%> (-0.50%)	⬇️
target_s3_jsonl/s3.py

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