Keptn 0.13.5

This is a bug fix release for Keptn containing fixes for the api, installer, shipyard-controller.

Bug Fixes

• api: Allow to enable/disable rate limit (#7535) (f1374ac)
• Disconnect MongoDB client before reconnecting (#7429) (4a92524)
• installer: Added missing quote (#7551) (16d0107)
• shipyard-controller: Consider parallel stages when trying to set overall sequence state to finished (#7237) (5ac31c4)
• shipyard-controller: Proceed with service deletion if the service is not present on the configuration service anymore (#7459) (c1d1a47)