bundle-networking: Fix metadata to correctly use "description" field.

Signed-off-by: Damien George <damien@micropython.org>

micropython/bundles/bundle-networking/manifest.py

@@ -1,6 +1,6 @@
 metadata(
     version="0.1.0",
-    metadata="Common networking packages for all network-capable deployments of MicroPython.",
+    description="Common networking packages for all network-capable deployments of MicroPython.",
 )
 
 require("mip")