Downgraded feedparser in requirements.txt to 5.2.1

Fixed issue #SICKRAGE-APP-5TZ - NoResultFound exception not handled in get_indexer_absolute_numbering function, not returns -1 when exception is thrown
Fixed issue #SICKRAGE-APP-5YH - FakeUserAgentError exception not handled when attempting to get a random user agent string for core web sessions, now returns default SR user agent string if exception is thrown
Fixed issue #SICKRAGE-APP-5XV - NoneType possibly returned when getting season/episode numbering from episode object due to improper comparison
Fixed issue #SICKRAGE-APP-5XE - AttributeError occurrence when trying to split show scene exceptions data by delimiter if previously never set
Fixed issue #SICKRAGE-APP-5ZS - TypeError thrown due to episode status being set as a string instead of a integer

Fixed issues with provider results containing both an airdate and season/episode in them being matched as standard to be matched as scene_date_format instead

# Conflicts:
#	sickrage/core/databases/main/db_repository/versions/016_Merge_Scene_Numbering_Table_With_TVEpisodes_Table.py