kata:rust: Point the rust version to KATA_RUST_VERSION
kata:rust: Point the rust version to KATA_RUST_VERSION

So we don't need to maintain the version at two places.

Change-Id: Ibbbb9b7744bdd4e209404bf744e2f57e0022db7a
GitOrigin-RevId: 7583eaba9d5364e6c47ede3e5fed4505c73ae790

AmbiML/sparrow-kata,AmbiML/sparrow-kata,AmbiML/sparrow-kata