Revert the use of subprocess

Cargo.lock

@@ -4002,7 +4002,6 @@ dependencies = [
  "serde_json",
  "sp-core",
  "sp-runtime",
- "subprocess",
  "temp-dir",
  "tokio",
  "tracing",
@@ -5044,16 +5043,6 @@ dependencies = [
  "syn 2.0.101",
 ]
 
-[[package]]
-name = "subprocess"
-version = "0.2.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c2e86926081dda636c546d8c5e641661049d7562a68f5488be4a1f7f66f6086"
-dependencies = [
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "substrate-bip39"
 version = "0.6.0"