Remove reqwest re-exports from eth2 (#8829)

Remove `reqwest` from being re-exported within `eth2`


Co-Authored-By: Mac L <mjladson@pm.me>

beacon_node/http_api/Cargo.toml

@@ -33,6 +33,7 @@ operation_pool = { workspace = true }
 parking_lot = { workspace = true }
 proto_array = { workspace = true }
 rand = { workspace = true }
+reqwest = { workspace = true }
 safe_arith = { workspace = true }
 sensitive_url = { workspace = true }
 serde = { workspace = true }