chore: bump runtimed Python package to 1.9.0

Stable release matching the v1.4.1-stable desktop build.
Pre-magic-bytes, pre-fractional-indexing. Pairs with nteract MCP 1.9.0.

Author: rgbkrk

python/runtimed/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "runtimed"
-version = "0.1.4"
+version = "1.9.0"
 description = "Python toolkit for Jupyter runtimes, powered by runtimed Rust binaries"
 readme = "README.md"
 license = "BSD-3-Clause"