Bug: Protobuf tests started failing

[zxPhoenix]

Hi,

Recently Protobuf tests started failing at least for old PBS code (v 3.16):

• Tests where the maven cache was found and successfully restored were passing.
• Tests where the maven cache did not exist and could not be restored were failing.

The error: PROTOC FAILED: test-opernrtb.proto:84:8: "com.iabtechlab.openrtb.v2.BidRequest.Imp.Video.CompanionAd" is not defined.

The reason:

• The POM file is referencing to : openrtb.proto
• This file was changed in the last several days: openrtb.proto update
• test-opernrtb.proto wasn’t updated according to openrtb.proto.

Updating the POM to reference the older version of the above file allows the tests to pass.

• https://raw.githubusercontent.com/IABTechLab/openrtb-proto-v2/fcb59b3b4fa7687c1db6e4866ec6f76c55849f2f/openrtb-core/src/main/protobuf/openrtb.proto
• https://github.com/IABTechLab/openrtb-proto-v2/blob/fcb59b3b4fa7687c1db6e4866ec6f76c55849f2f/openrtb-core/src/main/protobuf/openrtb.proto

Please introduce versioning for https://raw.githubusercontent.com/IABTechLab/openrtb-proto-v2/master/openrtb-core/src/main/protobuf/openrtb.proto file and keep it actual per PBS code version.