SKIP UPDATE CHECK: Quote postgres tag as workaround for Renovate bug

https://github.com/renovatebot/renovate/issues/15318#issuecomment-1129010429

Wrapping the tag in quotes seems to work as a workaround for now until the bug is fixed.

Ex: micah.nagel/micahnagel#185 (closed) , micah.nagel/micahnagel!190 (closed)