Update dependency wpackagist-theme/twentysixteen to v2.6

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentysixteen (source)	require	minor	2.5 -> 2.6

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composer.json

@@ -71,12 +71,12 @@
         "wpackagist-theme/twentyeleven": "3.9",
         "wpackagist-theme/twentyfifteen": "3.0",
         "wpackagist-theme/twentyfourteen": "3.2",
-        "wpackagist-theme/twentynineteen": "2.1",
-        "wpackagist-theme/twentyseventeen": "2.8",
+        "wpackagist-theme/twentynineteen": "2.2",
+        "wpackagist-theme/twentyseventeen": "2.9",
         "wpackagist-theme/twentysixteen": "2.6",
-        "wpackagist-theme/twentyten": "3.5",
+        "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",