Brightcom Adapter - Add encoding to request

[matan-ybrant]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other

Description of change

Adding missing encoding to part of the request sent via the Brightcom's adapter

• test parameters for validating bids

{
  bidder: '<bidder name>',
  params: {
    // ...
  }
}

• contact email of the adapter’s maintainer
• official adapter submission

Other information

[jaiminpanchal27]

Looks good.