Bump linregress due to security vulnerability (#9262)

https://rustsec.org/advisories/RUSTSEC-2021-0070

substrate/frame/benchmarking/Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-linregress = { version = "0.4.0", optional = true }
+linregress = { version = "0.4.3", optional = true }
 paste = "1.0"
 codec = { package = "parity-scale-codec", version = "2.0.0", default-features = false }
 sp-api = { version = "3.0.0", path = "../../primitives/api", default-features = false }
@@ -31,7 +31,7 @@ hex-literal = "0.3.1"
 serde = "1.0.101"
 
 [features]
-default = [ "std" ]
+default = ["std"]
 std = [
 	"codec/std",
 	"sp-runtime-interface/std",