chore: use context.Background() instead of context.TODO()

[chansuke]

Both functions yield the same empty, never-cancelled context, using context.Background() clarifies intent:

• context.Background() clearly conveys that the call is rooted at a top-level context that is never cancelled or timed-out
• new contributors no longer wonder whether cancellation was forgotten; they see an explicit, canonical root context everywhere

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.27%. Comparing base (daf5543) to head (f63301d).

Files with missing lines	Patch %	Lines
cmd/run.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1163   +/-   ##
=======================================
  Coverage   63.27%   63.27%           
=======================================
  Files          15       15           
  Lines        2358     2358           
=======================================
  Hits         1492     1492           
  Misses        771      771           
  Partials       95       95           

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[chengfang]

@chansuke can you describe why the changes are needed in the description section?

[chansuke]

@chengfang
Thank you so much for your commend and sorry for the late reply. I updated the description.