vendor: use 'x/net/trace' with std 'context'

[gyuho]

For #6174.

[heyitsanthony]

lgtm

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@3a93928). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #7788   +/-   ##
=========================================
  Coverage          ?   75.61%           
=========================================
  Files             ?      331           
  Lines             ?    26105           
  Branches          ?        0           
=========================================
  Hits              ?    19738           
  Misses            ?     4935           
  Partials          ?     1432

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