Apply go modernize

[philipch07]

Description

Applies go modernization suggestions, see https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize for more details.

Reference issue

N/A

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (87d915d) to head (61781e4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sip-over-websocket-to-webrtc/softphone/utils.go	0.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #374   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          28      28           
  Lines        3633    3633           
======================================
  Misses       3633    3633           

Flag	Coverage Δ
go	0.00% <0.00%> (ø)
wasm	0.00% <0.00%> (ø)

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