Cnvr adapter: pass prebids version number through for better tracking

[johnwier]

Pass the prebid server version in display manager for better tracking on our side

[github-actions]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors
• Coverage summary encompasses all commits leading up to the latest one, b60253f

conversant

Refer here for heat map coverage report

github.com/prebid/prebid-server/v3/adapters/conversant/conversant.go:23:	MakeRequests	93.3%
github.com/prebid/prebid-server/v3/adapters/conversant/conversant.go:86:	parseCnvrParams	95.0%
github.com/prebid/prebid-server/v3/adapters/conversant/conversant.go:160:	MakeBids	92.9%
github.com/prebid/prebid-server/v3/adapters/conversant/conversant.go:195:	getBidType	100.0%
github.com/prebid/prebid-server/v3/adapters/conversant/conversant.go:213:	Builder		100.0%
total:										(statements)	94.7%