Update dependency wpackagist-theme/twentytwelve to v3.6

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentytwelve (source)	require	minor	3.5 -> 3.6

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composer.json

@@ -76,7 +76,7 @@
         "wpackagist-theme/twentysixteen": "2.5",
         "wpackagist-theme/twentyten": "3.6",
         "wpackagist-theme/twentythirteen": "3.4",
-        "wpackagist-theme/twentytwelve": "3.5",
+        "wpackagist-theme/twentytwelve": "3.6",
         "wpackagist-theme/twentytwenty": "1.8",
         "wpackagist-theme/wp-andreas01": "2.0",
         "wpackagist-theme/zenlite": "4.10",