psr3: Update monolog version
psr3: Update monolog version

Update monolog library version to match require-dev constraints from
MediaWiki's composer.json. Also switch from tilde constraint
(>=1.18.2,<1.19.0) to caret constraint (>=1.22.0,<2.0) to make things
a bit more future proof. Monolog is pretty good at following semver.

Change-Id: I20d6a4f28741e7379c2c6ea598bd5dd6e2232e47

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant