Bug 1550565 - [mozlog] Update mozlog version number to 4.1 r=jgraham

The Mozlog version number needed to be updated to 4.1 for the new
release on PyPI. The dependencies of other libraries that require
mozlog were updated to reflect the new version. (mozversion,
mozrunner, mozprofile)

Differential Revision: https://phabricator.services.mozilla.com/D30550