[deps] Upgrade Greenmail to 1.6.4
@@ -35,7 +35,7 @@ commonsIoVersion = 2.8.0
feignVersion = 11.2
feignFormVersion = 3.8.0
githubVersion = 1.129
-greenmailVersion = 1.6.3
+greenmailVersion = 1.6.4
jacksonVersion = 2.12.3
jgitVersion = 5.11.0.202103091610-r
jipsyVersion = 1.1.1
