Changed the CPlaydate import to internal for the Lua type in the Playdate bindings target.

Sources/PlaydateKit/Lua/Lua.swift

@@ -1,6 +1,6 @@
 // A public import: `addFunction(_:name:)` and `pushFunction(_:)` expose the
 // `CFunction` alias of `lua_CFunction` in their public signatures.
-public import CPlaydate
+internal import CPlaydate
 
 /// The cached `playdate->lua` C API table.
 var luaAPI: UnsafePointer<playdate_lua> { Playdate.luaAPI.unsafelyUnwrapped }