Pyodide updates: pyemscripten platform tag (PEP 783), 314.0a1, pyodide-eol flag, and maintenance updates#2812

henryiii merged 31 commits intopypa:mainpypa/cibuildwheel:mainfrom

agriyakhetarpal:pyodide-updatesagriyakhetarpal/cibuildwheel:pyodide-updatesCopy head branch name to clipboard