Update to mongodb-crypt 1.6.1

JAVA-4778

Author: jyemin

build.gradle

@@ -49,7 +49,7 @@ ext {
     zstdVersion = '1.5.2-3'
     awsSdkV2Version = '2.17.293'
     awsSdkV1Version = '1.12.291'
-    mongoCryptVersion = '1.6.0-alpha0'
+    mongoCryptVersion = '1.6.1'
     projectReactorVersion = '2020.0.22'
     junitBomVersion = '5.8.1'
     gitVersion = getGitVersion()