Upgrade to Metabase v0.50.36

Metabase 0.49.12 was released: https://github.com/metabase/metabase/releases/tag/v0.49.12

Current version: v0.55.9.4

We will upgrade to the latest 0.50.x version (v0.50.36) as a first step. Upgrade to 0.55.x will be done in a separate ticket.

See changelog: https://github.com/metabase/metabase/blob/master/docs/developers-guide/driver-changelog.md

Also consider implementing #77.