update context.go Get/Set method use defer

[youngxhui]

Using defer to unlock is more in line with go standards

[codecov[bot]]

Codecov Report

Merging #3429 (fba9b29) into master (cc367f9) will increase coverage by 0.35%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3429      +/-   ##
==========================================
+ Coverage   98.27%   98.63%   +0.35%     
==========================================
  Files          42       42              
  Lines        3137     3139       +2     
==========================================
+ Hits         3083     3096      +13     
+ Misses         40       29      -11     
  Partials       14       14              

Flag	Coverage Δ
	98.63% <100.00%> (+0.35%)	:arrow_up:
go-1.16	∅ <ø> (∅)
go-1.17	98.53% <100.00%> (+0.35%)	:arrow_up:
go-1.18	98.53% <100.00%> (+0.35%)	:arrow_up:
go-1.19	98.63% <100.00%> (+0.35%)	:arrow_up:
macos-latest	98.63% <100.00%> (+0.35%)	:arrow_up:
ubuntu-latest	98.63% <100.00%> (+0.35%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
context.go	97.96% <100.00%> (ø)
recovery.go	98.11% <0.00%> (+0.03%)	:arrow_up:
render/toml.go	100.00% <0.00%> (+100.00%)	:arrow_up:

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