remove unused dependencies from security_keyvault (#487)

Author: bmc-msft

sdk/security_keyvault/Cargo.toml

@@ -15,18 +15,18 @@ edition = "2018"
 [dependencies]
 base64 = "0.13"
 thiserror = "1.0"
-reqwest = { version = "0.11", features = ["blocking", "json"] }
+reqwest = { version = "0.11", features = ["json"] }
 chrono = { version = "0.4", features = ["serde"] }
 const_format = "0.2.13"
 serde_json = "1.0"
 url = "2.2"
 serde = { version = "1.0", features = ["derive"] }
 getset = "0.1"
-oauth2 = "4.0.0"
 azure_core = { path = "../core", version = "0.1.0" }
-azure_identity = { version = "0.1", path = "../identity" }
 
 [dev-dependencies]
+oauth2 = "4.0.0"
+azure_identity = { path = "../identity" }
 mockito = "0.30"
 async-trait = "0.1"
 tokio = { version = "1.0", features = ["full"] }