Update dependency wpackagist-theme/twentysixteen to v2.9

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentysixteen (source)	require	minor	2.8 -> 2.9

---

Dependency Lookup Warnings

Warnings were logged while processing this repo. Please check the Dependency Dashboard for more information.

---

Configuration

Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.

composer.json

@@ -74,7 +74,7 @@
         "wpackagist-theme/twentyfourteen": "3.4",
         "wpackagist-theme/twentynineteen": "2.4",
         "wpackagist-theme/twentyseventeen": "3.1",
-        "wpackagist-theme/twentysixteen": "2.8",
+        "wpackagist-theme/twentysixteen": "2.9",
         "wpackagist-theme/twentyten": "3.7",
         "wpackagist-theme/twentythirteen": "3.6",
         "wpackagist-theme/twentytwelve": "3.8",