form_letters: update for 7.1

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

form-letters/net-next-closed

@@ -1,8 +1,8 @@
-We have already submitted our pull request with net-next material for v7.0,
+We have already submitted our pull request with net-next material for v7.1,
 and therefore net-next is closed for new drivers, features, code refactoring
 and optimizations. We are currently accepting bug fixes only.
 
-Please repost when net-next reopens after Feb 23rd.
+Please repost when net-next reopens after Apr 27th.
 
 RFC patches sent for review only are obviously welcome at any time.