Expired key for signed checksums

From: Pat via freebsd-security <freebsd-security_at_freebsd.org>
Date: Thu, 04 Nov 2021 19:01:50 UTC
Hello,

I am trying to verify the signed checksum file for FreeBSD 13, but the key that
gets checked is showing to be expired:
$ gpg --keyserver-options auto-key-retrieve \
--keyserver hkps://keyserver.ubuntu.com:443 \
--verify CHECKSUM.SHA256-FreeBSD-13.0-RELEASE-amd64.asc
gpg: Signature made Tue Apr 13 10:45:44 2021 CDT
gpg: using RSA key 8D12403C2E6CAB086CF64DA3031458A5478FE293
gpg: requesting key 031458A5478FE293 from hkps server keyserver.ubuntu.com
gpg: key 524F0C37A0B946A3: 76 signatures not checked due to missing keys
gpg: key 524F0C37A0B946A3: public key "Glen Barber <gjb@FreeBSD.org>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
gpg: Good signature from "Glen Barber <gjb@FreeBSD.org>" [expired]
gpg: aka "Glen Barber <glen.j.barber@gmail.com>" [expired]
gpg: aka "Glen Barber <gjb@keybase.io>" [expired]
gpg: aka "Glen Barber <gjb@glenbarber.us>" [expired]
gpg: Note: This key has expired!
Primary key fingerprint: 78B3 42BA 26C7 B2AC 681E A7BE 524F 0C37 A0B9 46A3
Subkey fingerprint: 8D12 403C 2E6C AB08 6CF6 4DA3 0314 58A5 478F E293

It does not matter what keyserver I try, I get the same expiration message. Yet
I see the key expiration was bumped[0]. How would I go about getting the updated
key? Or am I just going about this all wrong?

Thanks
Pat

[0]https://cgit.freebsd.org/doc/commit/?id=02910aa5ae75e7adf52e6bad662363e688fc7b9b