Bump version to 0.9.1-alpha and add optional development dependencies

Author: Lanred-Dev

pyproject.toml

@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "extro"
-version = "0.8.1-alpha"
+version = "0.9.0-alpha"
 description = "2D game engine with Raylib backend"
 authors = [{ name = "Landon Redmond" }]
 readme = "README.md"
@@ -18,6 +18,11 @@ dependencies = [
     "raylib>=5.5.0.3"
 ]
 
+[project.optional-dependencies]
+dev = [
+    "nanobind>=2.9.2",
+]
+
 [tool.setuptools]
 package-dir = { "" = "src" }
 include-package-data = true