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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patches/buddypress/0053-Patch-buddypress.patch

---- a/bp-core/bp-core-avatars.php
-+++ b/bp-core/bp-core-avatars.php
-@@ -209,7 +209,7 @@
- 		'css_id'        => false,
- 		'alt'           => '',
- 		'email'         => false,
--		'no_grav'       => null,
-+		'no_grav'       => true,
- 		'html'          => true,
- 		'title'         => '',
- 		'extra_attr'    => '',
-
-
-		
\ No newline at end of file