bump newrelic to latest of 5.x series
bump newrelic to latest of 5.x series

- 6.x dropped 3.5, that'll be for us with going to Django 3

Signed-off-by: Arthur Schiwon <9ae9918f3cbf5a90ebc25affe594cc53853aee42@arthur-schiwon.de>

nextcloud/appstore,nextcloud/appstore,nextcloud/appstore,nextcloud/appstore,nextcloud/appstore,nextcloud/appstore