refactor: replace []byte(fmt.Sprintf) with fmt.Appendf

[minxinyi]

What does this pull request do? Explain your changes. (required)

Specific updates (required)

Optimize code using a more modern writing style. Official support by Go Team. https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize.

How did you test each of these updates (required)

No need.

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[minxinyi]

friendly ping~

[minxinyi]

Anything need I to do?

[j0sh]

Thanks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.52335%. Comparing base (0372f07) to head (9860e1a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3685         +/-   ##
===================================================
+ Coverage   31.51917%   31.52335%   +0.00418%     
===================================================
  Files            159         159                 
  Lines          47901       47901                 
===================================================
+ Hits           15098       15100          +2     
+ Misses         31913       31912          -1     
+ Partials         890         889          -1     

see 2 files with indirect coverage changes

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see 2 files with indirect coverage changes

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