remove weighting and staking dependency in BABE (#3412)

* remove weighting and staking dependency in BABE

* bump spec version

* Update Cargo.toml

* Update lock

* Fix warnings.

substrate/node/runtime/src/lib.rs

@@ -80,7 +80,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to equal spec_version. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 140,
+	spec_version: 141,
 	impl_version: 141,
 	apis: RUNTIME_API_VERSIONS,
 };