Fix for zig 0.16.0-dev.164+bc7955306

[f1sty]

Latest changes in Zig master branch introduced breaking changes. This pull request implements needed changes to comply with new std.Io and std.fmt.Alt functionality.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.25%. Comparing base (576e940) to head (c36c4a7).

Files with missing lines	Patch %	Lines
src/lsp.zig	95.65%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   97.25%   97.25%           
=======================================
  Files           3        3           
  Lines        1566     1568    +2     
=======================================
+ Hits         1523     1525    +2     
  Misses         43       43           

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