fix version

Author: jgbradley1

backend/pyproject.toml

@@ -2,7 +2,7 @@
 name = "graphrag-app"
 description = "A web API wrapper around the official GraphRAG library."
 # we make the version defined here match the graphrag library version
-version = "2.1.0"
+version = "1.2.0"
 license = "MIT"
 authors = [
     {name = "Josh Bradley", email = "joshbradley@microsoft.com"},