weaver registry diff: --param is not supported

[lmolkova]

As a part of open-telemetry/semantic-conventions#2307, I'd like to use custom jinja template to render diff between main branch and previous semconv version.

I also want to be able to pass a param representing a future version of semconv.
Unfortunately diff command does not support --param - https://github.com/open-telemetry/weaver/blob/main/docs/usage.md#registry-diff