Update Rust crate openssl-src to v400

Author: renovate[bot]

Cargo.lock

@@ -69,7 +69,7 @@ opener = "0.8.0"
 openssl = { version = "0.10", optional = true }
 # HACK: Temporarily pinned due to ppc64 ELFv1/v2 ABI issue in 300.5.5, to be
 # removed when <https://github.com/openssl/openssl/issues/29815> lands.
-openssl-src = { version = "=300.5.4", optional = true }
+openssl-src = { version = "=400.0.0", optional = true }
 opentelemetry = { version = "0.32", optional = true }
 opentelemetry-otlp = { version = "0.32", features = ["grpc-tonic"], optional = true }
 opentelemetry_sdk = { version = "0.32", features = ["rt-tokio"], optional = true }