build(deps): update jsonrpc requirement from 0.19.0 to 0.20.0

Updates the requirements on [jsonrpc](https://github.com/rust-bitcoin/corepc) to permit the latest version.
- [Commits](rust-bitcoin/corepc@jsonrpc-0.19.0...jsonrpc-0.20.0)

---
updated-dependencies:
- dependency-name: jsonrpc
  dependency-version: 0.20.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.toml

@@ -19,7 +19,7 @@ default = ["30_0"]
 
 [dependencies]
 corepc-types = { version = "0.12.0", features = ["default"]}
-jsonrpc = { version = "0.19.0", features = ["bitreq_http"] }
+jsonrpc = { version = "0.20.0", features = ["bitreq_http"] }
 
 # These pins are needed for `Cargo-minimal.lock`:
 hex-conservative = { version = "0.2.1" } # blame: corepc-node