Update the expiration date for the core-secretary key to 8 July 2017:

% gpg --list-keys core-secretary
pub 4096R/0x36A7C05FE1ECF9BB 2014-07-09 [expires: 2017-07-08]
uid [ultimate] FreeBSD Core Team Secretary <core-secretary@freebsd.org>
uid [ultimate] Core Secretary <core-secretary@freebsd.org>
sub 4096R/0x7B5150C8D7CE5D02 2014-07-09 [expires: 2017-07-08]