netfs, cachefiles: Change mailing list

The publicly accessible archives for Red Hat mailing lists stop at Oct
2023; messages sent after that time are in internal-only archives.

Change the netfs and cachefiles mailing list to one that has publicly
accessible archives:

	netfs@lists.linux.dev

Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20240122115007.3820330-2-dhowells@redhat.com
cc: Jeff Layton <jlayton@kernel.org>
cc: Matthew Wilcox <willy@infradead.org>
cc:  <netfs@lists.linux.dev>
cc:  <linux-cachefs@redhat.com>
cc:  <v9fs@lists.linux.dev>
cc:  <linux-afs@lists.infradead.org>
cc:  <ceph-devel@vger.kernel.org>
cc:  <linux-cifs@vger.kernel.org>
cc:  <linux-erofs@lists.ozlabs.org>
cc:  <linux-nfs@vger.kernel.org>
cc:  <linux-fsdevel@vger.kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>