Update dependency wpackagist-theme/twentyeleven to v4.3

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentyeleven (source)	require	minor	4.2 -> 4.3

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composer.json

@@ -69,7 +69,7 @@
         "wpackagist-theme/tanzaku": "1.1.1",
         "wpackagist-theme/thematic": "1.0.4",
         "wpackagist-theme/threattocreativity": "3.2",
-        "wpackagist-theme/twentyeleven": "4.2",
+        "wpackagist-theme/twentyeleven": "4.3",
         "wpackagist-theme/twentyfifteen": "3.2",
         "wpackagist-theme/twentyfourteen": "3.4",
         "wpackagist-theme/twentynineteen": "2.4",