ODK Central v1.5.3

Bugs Fixed + Small Wins

• Remove ability to create backups config
• Update Sentry ingestion URL (#311)
• Set Sentry username (getodk/central-backend#521)
• Set Sentry environment (getodk/central-backend#547)
• Prevent database connection leak after too many concurrent requests (getodk/central-backend#482)
• Prevent database connection leak after premature close (getodk/central-backend#485)
• Destroy inactive database streams (getodk/central-backend#565)
• Handle error creating database stream (getodk/central-backend#479)
• Set security headers at root path (#303)
• Don't include referrer information in cross-origin requests (#314)
• Update Enketo
• Update server url configuration for Enketo
• Update translations