Update dependency wpackagist-theme/twentynineteen to v2.2

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentynineteen (source)	require	minor	2.1 -> 2.2

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composer.json

@@ -71,7 +71,7 @@
         "wpackagist-theme/twentyeleven": "3.9",
         "wpackagist-theme/twentyfifteen": "3.0",
         "wpackagist-theme/twentyfourteen": "3.2",
-        "wpackagist-theme/twentynineteen": "2.1",
+        "wpackagist-theme/twentynineteen": "2.2",
         "wpackagist-theme/twentyseventeen": "2.9",
         "wpackagist-theme/twentysixteen": "2.5",
         "wpackagist-theme/twentyten": "3.5",