Release 0.22.0 (#1974)

diff --git a/version.bzl b/version.bzl
index 63fe208..21e6ce2 100644
--- a/version.bzl
+++ b/version.bzl
@@ -1,3 +1,3 @@
 """The version of rules_rust."""
 
-VERSION = "0.21.1"
+VERSION = "0.22.0"