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

@@ -85,7 +85,6 @@
 	"noblogs/event-list": "0.8.6",
         "noblogs/r2db": "0.1.7",
         "noblogs/ai-global-activity-plugin": "0.0.18",
-        "noblogs/ai-buddypress-plugin": "0.1.1",
         "noblogs/ai-mu-plugins": "0.3.1",
         "noblogs/noblogs-wp-ssl": "0.1.0",
         "noblogs/remove-gravatar": "0.1.1",
@@ -109,7 +108,6 @@
         "wpackagist-plugin/wordpress-importer": "0.7",
         "wpackagist-plugin/wp-recaptcha-bp": "4.1",
         "wpackagist-plugin/wp2pgpmail": "1.28",
-        "wpackagist-plugin/buddypress": "9.1.1",
         "noblogs/noblogs-home": "0.1.4",
         "wpackagist-plugin/katex": "2.2.3",
         "noblogs/eu-compliance": "0.1.0",