Replace bytes.Buffer with strings.Builder where appropriate

[hopehook]

To build strings more efficiently, use strings.Builder instead.

[appleboy]

please rebase the master branch.

[codecov[bot]]

Codecov Report

Merging #3347 (8489cb2) into master (33ab0fc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3347   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files          42       42           
  Lines        3127     3127           
=======================================
  Hits         3073     3073           
  Misses         40       40           
  Partials       14       14           

Flag	Coverage Δ
	98.27% <ø> (ø)
go-1.16	∅ <ø> (?)
go-1.17	98.17% <ø> (ø)
go-1.18	98.17% <ø> (ø)
go-1.19	98.27% <ø> (ø)
macos-latest	98.27% <ø> (ø)
ubuntu-latest	98.27% <ø> (ø)

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