Nextmillennium: New fields and adapter version update

[allar15]

This PR updates the adapter version and adds new fields

[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, 7986b9e

nextmillennium

Refer here for heat map coverage report

github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:51:	MakeRequests		90.0%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:69:	getImpressionsInfo	100.0%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:83:	getImpressionExt	85.7%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:100:	buildAdapterRequest	88.9%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:121:	createBidRequest	93.8%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:172:	MakeBids		81.8%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:212:	Builder			80.0%
github.com/prebid/prebid-server/v3/adapters/nextmillennium/nextmillennium.go:227:	getBidType		75.0%
total:											(statements)		88.5%