[blacksmith] Bump version to 4.2.1-rc0

Author: bastelfreak

metadata.json

@@ -1,6 +1,6 @@
 {
   "name": "puppet-openssl",
-  "version": "4.2.0",
+  "version": "4.2.1-rc0",
   "author": "Vox Pupuli",
   "summary": "OpenSSL Module",
   "license": "Apache-2.0",