Drop getrandom 💡

I just realized that we probably only needed this because we were
importing dependencies from pallet-claims with the default-features
enabled, which caused getrandom from being pulled with enabled std WHILE
trying to build it for wasm, which caused the failing compilation
error. Now that those dependencies are imported correctly with
default-features = false, we in fact don't need this getrandom
workaround anymore :)

Cargo.toml

@@ -64,7 +64,6 @@ members = [
 clap = { version = "3.1", features = [ "derive" ] }
 codec = { package = "parity-scale-codec", version = "3.0", default-features = false }
 futures = { version = "0.3.21", features = ["compat"] }
-getrandom = { version = "0.2", default-features = false, features = ["js"] }
 hex-literal = "0.2.1"
 jsonrpsee = { version = "0.15.1", features = ["server", "macros"] }
 log = "0.4.8"
@@ -187,7 +186,6 @@ std = [
 	"sc-service/rocksdb",
 	"substrate-build-script-utils",
 	"sp-consensus-babe/std",
-	"getrandom/std",
 ]
 runtime-benchmarks = [
 	"frame-benchmarking/runtime-benchmarks",