Update subscription-manager to 1.28.4-1
Resolves: #1847910 - DNF plugins are part of sub-man RPM, libdnf RPM
Resolves: #1826300 - Ignore auto-attach, when SCA mode is used
Resolves: #1862431 - option validation error from unexpected config entry
Resolves: #1844508 - sub-man sends version in the User-Agent header
Resolves: #1855437 - syspurpose CLI should require sub-man rpm
Resolves: #1870567 - Fix issue with locale and D-Bus method GetStatus
Resolves: #1868734 - Fix issue with syspurpose attrs. set in act. key
Resolves: #1753236 - D-Bus Register properly, when org not specified