fix(inlay_hints): disable strict_indexing for nvim_buf_get_lines

PR: simrat39#353

Author: arindas

lua/rust-tools/inlay_hints.lua

@@ -148,7 +148,7 @@ local function parse_hints(result, bufnr)
     end
 
     local line_len =
-      string.len(vim.api.nvim_buf_get_lines(bufnr, line, line + 1, true)[1])
+      string.len(vim.api.nvim_buf_get_lines(bufnr, line, line + 1, false)[1] or "")
     max_line_len = math.max(max_line_len, line_len)
 
     add_line()