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

@@ -8,7 +8,10 @@
 
 # First look for python bundled in Emsdk
 if [ -z "$EMSDK_PYTHON" ]; then
-  PYTHON3="$(dirname "$0")/python/3.9.2-1_64bit/bin/python3"
+  PYTHON3="$(dirname "$0")/python/3.13.3-0_64bit/bin/python3"
+  if [ ! -f "$PYTHON3" ]; then
+    PYTHON3="$(dirname "$0")/python/3.9.2-1_64bit/bin/python3"
+  fi
   if [ -f "$PYTHON3" ]; then
     EMSDK_PYTHON="$PYTHON3"