Fix sanity-tests compilation & subxt tags warning

live-tests/Cargo.toml

@@ -12,8 +12,8 @@ version.workspace = true
 anyhow = { workspace = true }
 codec = { workspace = true }
 countmap = { workspace = true }
-sp-core = { workspace = true }
-sp-runtime = { workspace = true }
+sp-core = { workspace = true, features = ["std"] }
+sp-runtime = { workspace = true, features = ["std"] }
 subxt = { workspace = true, features = [
     "native",
     "jsonrpsee",
@@ -22,5 +22,4 @@ tokio = { workspace = true, features = ["macros", "time", "rt-multi-thread"] }
 
 [features]
 runtime-benchmarks = []
-std = []
 try-runtime = []