fix: Replace bind params with f-string for arguments passing on SET c…

[kziovas]

What kind of change does this PR introduce?

Fix that addresses a major bug. Replace bind params with f-string for arguments passing on SET command, cause bind params are not allowed in pg8000, if that client is used.

What is the current behaviour?

See the issue and discussion here

What is the new behaviour?

Exactly the same but works with all postgres clients and all pg versions.

Additional context

Add any other context or screenshots.