Update package version to 0.206.0.dev3 (#1239)

### Description

As per title.
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pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "metricflow"
-version = "0.206.0.dev2"
+version = "0.206.0.dev3"
 description = "Translates a simple metric definition into reusable SQL and executes it against the SQL engine of your choice."
 readme = "README.md"
 requires-python = ">=3.8,<3.13"