share.SharesAvailable can not be called from other JSON RPC frameworks due to a bug in go-jsonrpc

### Celestia Node version

eaa58358b21f9ffbb580de48071e2315e55a2b9c

### OS

Linux

### Install tools

_No response_

### Others

_No response_

### Steps to reproduce it

Call `share.SharesAvailable` form JSON RPC clients other than go-jsonrpc. In our case we used [jsonrpsee](https://github.com/paritytech/jsonrpsee).

### Expected result

A response that has `result` or `error` field.

### Actual result

Server responds with `{"jsonrpc":"2.0","id":1}`, which is causing deserialization issues on the client side.

### Relevant log output

_No response_

### Notes

This is a bug in go-jsonrpc, but reported too here for tracking. Check https://github.com/filecoin-project/go-jsonrpc/issues/102