Bump composer/installers from 1.9.0 to 1.12.0

Bumps [composer/installers](https://github.com/composer/installers) from 1.9.0 to 1.12.0.
- [Release notes](https://github.com/composer/installers/releases)
- [Changelog](https://github.com/composer/installers/blob/main/CHANGELOG.md)
- [Commits](https://github.com/composer/installers/compare/v1.9.0...v1.12.0)

---
updated-dependencies:
- dependency-name: composer/installers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.lock

@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "059d238d3535c84ce365607bf4a4b989",
+    "content-hash": "82a6c1b3ddb7f8bb2af896915dfe3935",
     "packages": [
         {
             "name": "composer/installers",
-            "version": "v1.9.0",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/installers.git",
-                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca"
+                "reference": "d20a64ed3c94748397ff5973488761b22f6d3f19"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/installers/zipball/b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
-                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
+                "url": "https://api.github.com/repos/composer/installers/zipball/d20a64ed3c94748397ff5973488761b22f6d3f19",
+                "reference": "d20a64ed3c94748397ff5973488761b22f6d3f19",
                 "shasum": ""
             },
             "require": {
@@ -28,17 +28,18 @@
                 "shama/baton": "*"
             },
             "require-dev": {
-                "composer/composer": "1.6.* || 2.0.*@dev",
-                "composer/semver": "1.0.* || 2.0.*@dev",
-                "phpunit/phpunit": "^4.8.36",
-                "sebastian/comparator": "^1.2.4",
+                "composer/composer": "1.6.* || ^2.0",
+                "composer/semver": "^1 || ^3",
+                "phpstan/phpstan": "^0.12.55",
+                "phpstan/phpstan-phpunit": "^0.12.16",
+                "symfony/phpunit-bridge": "^4.2 || ^5",
                 "symfony/process": "^2.3"
             },
             "type": "composer-plugin",
             "extra": {
                 "class": "Composer\\Installers\\Plugin",
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-main": "1.x-dev"
                 }
             },
             "autoload": {
@@ -76,6 +77,7 @@
                 "Porto",
                 "RadPHP",
                 "SMF",
+                "Starbug",
                 "Thelia",
                 "Whmcs",
                 "WolfCMS",
@@ -109,13 +111,16 @@
                 "majima",
                 "mako",
                 "mediawiki",
+                "miaoxing",
                 "modulework",
                 "modx",
                 "moodle",
                 "osclass",
+                "pantheon",
                 "phpbb",
                 "piwik",
                 "ppi",
+                "processwire",
                 "puppet",
                 "pxcms",
                 "reindex",
@@ -125,6 +130,7 @@
                 "sydes",
                 "sylius",
                 "symfony",
+                "tastyigniter",
                 "typo3",
                 "wordpress",
                 "yawik",
@@ -136,12 +142,16 @@
                     "url": "https://packagist.com",
                     "type": "custom"
                 },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
                 {
                     "url": "https://tidelift.com/funding/github/packagist/composer/composer",
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-04-07T06:57:05+00:00"
+            "time": "2021-09-13T08:19:44+00:00"
         },
         {
             "name": "pressbooks/mix",