[Pyodide] Pyodide 0.18.0

Hello all, we are happy to announce the release of Pyodide 0.18.0 which happened last week. This releases includes migration to Python 3.9.5, experimental Node.js support, support of ctypes, as well as many improvements of the JavaScript package and type translation API. See the detailed changelog in https://pyodide.org/en/stable/project/changelog.html#version-0-18-0 Thanks to everyone who contributed to this release! -- Roman Yurchak