tools(both): make gocov compatible with go1.18

[sleepymole]

What problem does this PR solve?

Issue Number: ref #5037

#5038 used go1.18 generic, but gocov didn't work.

What is changed and how it works?

replace github.com/axw/gocov => github.com/jdemeyer/gocov v1.0.1-0.20220316125951-e6ea120e4bdf

After axw/gocov#91 is merged, we can remove this replace and upgrade gocov.

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lance6716
• overvenus

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[sleepymole]

/run-verify

[codecov-commenter]

Codecov Report

Merging #5050 (bfb1b23) into master (687e248) will decrease coverage by 0.3764%.
The diff coverage is 55.8441%.

Flag	Coverage Δ
cdc	61.1998% <48.8328%> (+0.6011%)	⬆️
dm	51.3926% <87.3949%> (-1.0769%)	⬇️

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

@@               Coverage Diff                @@
##             master      #5050        +/-   ##
================================================
- Coverage   56.1240%   55.7475%   -0.3765%     
================================================
  Files           522        526         +4     
  Lines         65325      67420      +2095     
================================================
+ Hits          36663      37585       +922     
- Misses        25094      26116      +1022     
- Partials       3568       3719       +151     

[lance6716]

/cc @hi-rustin

[overvenus]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 8838a3a

[ti-chi-bot]

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[sleepymole]

/run-verify