refactor: refactor timeout handling in timeout.go and timeout_test.go

[appleboy]

• Remove the import statement for "context" in timeout.go
• Remove the code block related to context cancellation in the New function in timeout.go
• Replace the case statement in the New function in timeout.go with a case statement using time.After
• Remove the import statement for "sync" in timeout_test.go
• Remove the TestDeadlineExceeded function in timeout_test.go

reverted PR #54

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (df5d291) 92.91% compared to head (f1ccf97) 94.91%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   92.91%   94.91%   +2.00%     
==========================================
  Files           4        4              
  Lines         127      118       -9     
==========================================
- Hits          118      112       -6     
+ Misses          6        4       -2     
+ Partials        3        2       -1     

Flag	Coverage Δ
go-	94.91% <100.00%> (?)
go-1.18	94.91% <100.00%> (+2.00%)	⬆️
go-1.19	94.91% <100.00%> (+2.00%)	⬆️
go-1.20	94.91% <100.00%> (?)
go-1.21	89.83% <100.00%> (?)
macos-latest	94.91% <100.00%> (?)
ubuntu-latest	94.91% <100.00%> (+2.00%)	⬆️

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