MAINTAINERS: step down as netfilter maintainer

I do not feel that I'm up to the task anymore.

I hope this to be a temporary emergeny measure, but for now I'm sure this
is the best course of action for me.

Signed-off-by: Florian Westphal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: Florian Westphal

MAINTAINERS

@@ -15164,7 +15164,6 @@ F:	drivers/net/ethernet/neterion/
 NETFILTER
 M:	Pablo Neira Ayuso <[email protected]>
 M:	Jozsef Kadlecsik <[email protected]>
-M:	Florian Westphal <[email protected]>
 L:	[email protected]
 L:	[email protected]
 S:	Maintained