Update Python to 3.13.3 and add support to Windows on ARM64. (#1477)

Update Python to 3.13.0 and add support to Windows on AMD64. Rewrite
packaging of pywin32 because it is no longer shipped via separate binary
installers, but has migrated to use pip.

emsdk.bat

@@ -7,6 +7,14 @@ setlocal
 :: When using our bundled python we never want the users
 :: PYTHONHOME or PYTHONPATH
 :: https://github.com/emscripten-core/emsdk/issues/598
+
+if exist "%~dp0python\3.13.3-0_64bit\python.exe" (
+  set EMSDK_PY="%~dp0python\3.13.3-0_64bit\python.exe"
+  set PYTHONHOME=
+  set PYTHONPATH=
+  goto end
+)
+
 if exist "%~dp0python\3.9.2-1_64bit\python.exe" (
   set EMSDK_PY="%~dp0python\3.9.2-1_64bit\python.exe"
   set PYTHONHOME=