chore: Set 0.12 version in pyproject.toml (#867)

Forgot to do in #866

Author: kylebarron

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "lonboard"
-version = "0.11.1"
+version = "0.12.0"
 description = "Fast, interactive geospatial data visualization in Jupyter."
 authors = [{ name = "Kyle Barron", email = "[email protected]" }]
 license = "MIT"