removed mandatory Version HTTP header in ApiVersion operations to align with SOL013ed431

endpoints:

  api_versions:

    parameters:

      - name: Version

        description: >

          Version of the API requested to use when responding to this request.

        in: header

        required: false

        schema:

          type: string

      - name: Authorization

        description: >-

          The authorization token for the request. Reference: IETF RFC 7235