chore: remove kerberos password COMPASS-4378

[rose-m]

Description

Removes the Kerberos password field from the connection model. Also bumps mongodb-runner to the latest version to make it work on Node 14.x.

Motivation and Context

• [ ] Bugfix
• [ ] New feature
• [ ] Dependency update
• [x] Misc

Types of changes

• [ ] Backport Needed
• [x] Patch (non-breaking change which fixes an issue)
• [ ] Minor (non-breaking change which adds functionality)
• [ ] Major (fix or feature that would cause existing functionality to change)

[rose-m]

@mcasimir I've added a tiny test to at least ensure the parsing of old-style URLs with passwords works and when you transform again to URL it's gone.