The versioned API spec defines the various enum cases for the API versions as v1, while we name it Version1. This leads to a somewhat verbose invocation of ServerApiVersion::Version1. We should update our variant to match that of the specification, namely V1, for consistency with other drivers and brevity.

Note: the std library uses a similar naming convention for IP addresses: https://doc.rust-lang.org/std/net/enum.IpAddr.html#variants