deps: Simplify `jsonrpc` feature selection

[ValuedMammal]

bdk-bitcoind-client/Cargo.toml

Lines 14 to 16 in f627ccb

	[dependencies]
	corepc-types = { version = "0.11.0", features = ["default"]}
	jsonrpc = { version = "0.19.0", features = ["simple_http", "simple_tcp", "bitreq_http", "simple_uds", "proxy"] }

question: do we need all these features ? I guess probably only bitreq and proxy ones are sufficient.

Originally posted by @oleonardolima in #5 (comment)