Migrate from gnome-keyring to oo7

[yselkowitz]

https://fedoraproject.org/wiki/Changes/oo7_Secrets_Service_Provider

[yselkowitz]

gdm needs to change its dependency to Requires: (pam_oo7 or gnome-keyring-pam) and then we probably need a hint to prefer pam_oo7 in fedora-eln-release and possibly CR.

[yselkowitz]

https://src.fedoraproject.org/rpms/gdm/c/2bcbc53bf1f3a2a121e01953335b25e63f12e1f3

[yselkowitz]

https://forge.fedoraproject.org/releng/pungi-fedora/pulls/1699