Update BAML submodule and version to 0.90.2

Author: emilsoman

lib/baml_elixir.ex

@@ -1,5 +1,5 @@
 defmodule BamlElixir do
-  @baml_version "0.87.2"
+  @baml_version "0.90.2"
 
   def baml_version, do: @baml_version
 end