fix: move Typst annotation require() inside function scope

The bundled main.lua is at exactly 200 top-level locals (the Lua
compiler limit). Move the require("modules/typst-code-annotations")
from file scope into the code_annotations() function body so it
does not add to the top-level local count.

Author: mcanouil

src/resources/filters/quarto-pre/code-annotation.lua

@@ -2,7 +2,6 @@
 -- Copyright (C) 2020-2022 Posit Software, PBC
 
 local constants = require("modules/constants")
-local typstAnnotations = require("modules/typst-code-annotations")
 
 
 local hasAnnotations = false
@@ -289,6 +288,8 @@ end
 -- The actual filter that will look for a code cell and then
 -- find its annotations, then process the subsequent OL
 function code_annotations()
+  local typstAnnotations = require("modules/typst-code-annotations")
+
   -- the localized strings
   local language = param("language", nil)