perf(validate): use lighter version

- Also fix `vim.validate()` for PUC Lua when showing errors for values
  that aren't string or number.

runtime/lua/vim/secure.lua

@@ -26,7 +26,7 @@ end
 ---
 ---@param trust table<string, string> Trust table to write
 local function write_trust(trust)
-  vim.validate({ trust = { trust, 't' } })
+  vim.validate('trust', trust, 'table')
   local f = assert(io.open(vim.fn.stdpath('state') .. '/trust', 'w'))
 
   local t = {} ---@type string[]
@@ -49,7 +49,7 @@ end
 ---@return (string|nil) The contents of the given file if it exists and is
 ---        trusted, or nil otherwise.
 function M.read(path)
-  vim.validate({ path = { path, 's' } })
+  vim.validate('path', path, 'string')
   local fullpath = vim.uv.fs_realpath(vim.fs.normalize(path))
   if not fullpath then
     return nil