Use different version specifier for jxmpp and MiniDNS

Fixes SMACK-858.

version.gradle

@@ -2,8 +2,12 @@ allprojects {
 	ext {
 		shortVersion = '4.3.3'
 		isSnapshot = true
-		jxmppVersion = '[0.6, 0.7)'
-		miniDnsVersion = '[0.3, 0.4)'
+		// When using dynamic versions for those, do *not* use [1.0,
+		// 2.0), since this will also pull in 2.0-alpha1. Instead use
+		// [1.0, 1.0.99].
+		// See also https://issues.apache.org/jira/browse/MNG-6232
+		jxmppVersion = '[0.6, 0.6.999]'
+		miniDnsVersion = '[0.3, 0.3.999]'
 		smackMinAndroidSdk = 9
 	}
 }