Switch date format to RFC 3339 in security.txt

2023-02-08 08:35:06 -05:00 · 2023-02-08 08:35:06 -05:00 · 1c7e129f3b
commit 1c7e129f3b
--- a/security.txt
+++ b/security.txt
@ -1,6 +1,6 @@
 Contact: mailto:info@friendi.ca

-Expires: Sun, 31 Dec 2023 23:59 +0000
+Expires: 2023-12-31T23:59:59Z

 Preferred-Languages: en