RTB House: declare oRTB 2.6 support

[piotrj-rtbh]

🔧 Type of changes

• bid adapter update
• configuration

✨ What's the context?

Declaring support for Open RTB 2.6
Go counterpart: prebid/prebid-server#4202

🧠 Rationale behind the change

Our bidder support Open RTB 2.6 requests.

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code?
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes?

Other information

Please reach us at inventory_support@rtbhouse.com with piotr.jaworski@rtbhouse.com and cc leandro.otani@rtbhouse.com.

[piotrj-rtbh]

@osulzhenko Unfortunately I am not able to review PRs. Did you mean somebody else?

[osulzhenko]

@piotrj-rtbh I set you as the assignee because you are responsible for managing and updating the PR. However, the reviewers, who will provide feedback and approve the changes, will be different people