python,python3: Use ensurepip=upgrade for host Python

This changes --with-ensurepip=install to upgrade, to upgrade host
versions of setuptools and pip to the Python-bundled versions.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python3/Makefile

@@ -289,7 +289,7 @@ HOST_CONFIGURE_ARGS+= \
 	--prefix=$(HOST_PYTHON3_DIR) \
 	--exec-prefix=$(HOST_PYTHON3_DIR) \
 	--with-system-expat=$(STAGING_DIR_HOSTPKG) \
-	--with-ensurepip=install \
+	--with-ensurepip=upgrade \
 	CONFIG_SITE=
 
 define Host/Compile