all: remove go.lsp.dev/pkg dependency

[zchee]

all: remove go.lsp.dev/pkg dependency.

[codecov]

Codecov Report

Merging #23 (8c68d4f) into main (b55d5d7) will decrease coverage by 0.5%.
The diff coverage is 69.2%.

@@           Coverage Diff           @@
##            main     #23     +/-   ##
=======================================
- Coverage   54.4%   53.8%   -0.6%     
=======================================
  Files          8       8             
  Lines        707     642     -65     
=======================================
- Hits         385     346     -39     
+ Misses       283     261     -22     
+ Partials      39      35      -4     

Impacted Files	Coverage Δ
handler.go	0.0% <0.0%> (ø)
conn.go	63.0% <66.6%> (-1.8%)	⬇️
serve.go	79.7% <100.0%> (+6.9%)	⬆️
message.go	38.6% <0.0%> (-0.6%)	⬇️

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