Support version-specific Manifest

[quachpas]

This adds to the list of manifest candidates the version-specific Manifest based on the Julia version of the LSP.

Sort of related: julia-vscode/SymbolServer.jl#303, julia-vscode/LanguageServer.jl#1372

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (33904db) to head (6a98e62).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fileio.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #62   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         14      14           
  Lines        661     661           
=====================================
  Misses       661     661           

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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