The following file is not up to date: https://gnupg.org/ftp/gcrypt/binary/index.html
From https://gnupg.org/ftp/gcrypt/binary/index.html
"Index generated Mon Dec 7 08:46:57 2015 UTC"
A more current/complete list:
ftp://ftp.gnupg.org/gcrypt/binary/
Both 2.1.11 and 2.1.12 are not in the index, so the update
was missed during the release process.
Werner, you probably know best where to place it in the release process,
so that it is not forgotten. An alternative would be to use a directory listing
module of the webserver which does this more dynamically (and caches the result).