Add release version to oapi file

[dapplion]

Here

https://github.com/ethereum/builder-specs/blob/b66471c67f24b6c29a3e5461720c8620310815c6/builder-oapi.yaml#L22

Either at release time or in master should indicate the release version

[staccDOTsol]

Thank you for bringing this to my attention. I will make sure to add the release version to the oapi file in the specified location. This will help provide clarity and ensure that users can easily identify the release version.