Update dependency composer/installers to v1.12.0

This MR contains the following updates:

Package	Type	Update	Change
composer/installers (source)	require	minor	1.11.0 -> 1.12.0

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Release Notes

composer/installers

v1.12.0

Compare Source

Added

• Added installer for Pantheon Quicksilver modules/scripts #​495.

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composer.json

@@ -37,7 +37,7 @@
         "koodimonni/composer-dropin-installer": "1.3",
         "johnpbloch/wordpress": "5.9.0",
         "bjornjohansen/wplang": "0.1.1",
-        "wpackagist-plugin/disable-wordpress-updates": "1.6.8",
+        "wpackagist-plugin/disable-wordpress-updates": "1.7.0",
         "wpackagist-plugin/more-privacy-options": "4.6",
         "wpackagist-plugin/disable-emojis": "1.7.3",
         "wpackagist-plugin/wp-super-cache": "1.7.7",
@@ -68,14 +68,14 @@
         "wpackagist-theme/thematic": "1.0.4",
         "wpackagist-theme/the-scenery": "0.93",
         "wpackagist-theme/threattocreativity": "3.2",
-        "wpackagist-theme/twentyeleven": "3.9",
-        "wpackagist-theme/twentyfifteen": "3.0",
-        "wpackagist-theme/twentyfourteen": "3.2",
+        "wpackagist-theme/twentyeleven": "4.0",
+        "wpackagist-theme/twentyfifteen": "3.1",
+        "wpackagist-theme/twentyfourteen": "3.3",
         "wpackagist-theme/twentynineteen": "2.2",
         "wpackagist-theme/twentyseventeen": "2.9",
         "wpackagist-theme/twentysixteen": "2.5",
         "wpackagist-theme/twentyten": "3.6",
-        "wpackagist-theme/twentythirteen": "3.4",
+        "wpackagist-theme/twentythirteen": "3.5",
         "wpackagist-theme/twentytwelve": "3.6",
         "wpackagist-theme/twentytwenty": "1.9",
         "wpackagist-theme/wp-andreas01": "2.0",
@@ -99,7 +99,7 @@
         "wpackagist-plugin/footnotation": "1.2",
         "wpackagist-plugin/i-love-xm24-ribbon": "0.0.4",
         "wpackagist-plugin/nofollow-free": "1.6.3",
-        "wpackagist-plugin/pubsubhubbub": "3.1.0",
+        "wpackagist-plugin/pubsubhubbub": "3.1.2",
         "wpackagist-plugin/rss-license": "0.1",
         "wpackagist-plugin/simply-exclude": "2.0.6.6",
         "wpackagist-plugin/soundcloud-shortcode": "3.0.2",