Bug 1929510 - Update mozdevice version to 4.2.0. r=jgraham

Differential Revision: https://phabricator.services.mozilla.com/D228152

testing/mozbase/mozdevice/setup.py

@@ -5,7 +5,7 @@
 from setuptools import setup
 
 PACKAGE_NAME = "mozdevice"
-PACKAGE_VERSION = "4.1.2"
+PACKAGE_VERSION = "4.2.0"
 
 deps = ["mozlog >= 6.0"]