Update RPC client version (#1731)

Author: dmkozh

docs/networks/software-versions.mdx

@@ -31,7 +31,7 @@ Release candidates are software releases that are also released to the [Testnet]
 | Stellar JS Stellar Base | `v14.0.0` |
 | Stellar JS Stellar SDK | `v14.1.1` |
 | Stellar Horizon Client & TxnBuild | `v23.0.0` |
-| Stellar RPC Client | `tbd` |
+| Rust Stellar RPC Client | `v23.0.0` |
 | Freighter | `v5.34.1` |
 | Laboratory | `N/A` |
 | Futurenet Network Passphrase | `Test SDF Future Network ; October 2022` |