Issue #3159730 by alexpott, greg.1.anderson: Update composer/installers in root composer.json and lock so we can use Composer 2

composer.lock

@@ -60,28 +60,31 @@
         },
         {
             "name": "composer/installers",
-            "version": "v1.7.0",
+            "version": "v1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/installers.git",
-                "reference": "141b272484481432cda342727a427dc1e206bfa0"
+                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/installers/zipball/141b272484481432cda342727a427dc1e206bfa0",
+                "url": "https://api.github.com/repos/composer/installers/zipball/b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
-                "reference": "141b272484481432cda342727a427dc1e206bfa0",
+                "reference": "b93bcf0fa1fccb0b7d176b0967d969691cd74cca",
                 "shasum": ""
             },
             "require": {
-                "composer-plugin-api": "^1.0"
+                "composer-plugin-api": "^1.0 || ^2.0"
             },
             "replace": {
                 "roundcube/plugin-installer": "*",
                 "shama/baton": "*"
             },
             "require-dev": {
-                "composer/composer": "1.0.*@dev",
+                "composer/composer": "1.6.* || 2.0.*@dev",
-                "phpunit/phpunit": "^4.8.36"
+                "composer/semver": "1.0.* || 2.0.*@dev",
+                "phpunit/phpunit": "^4.8.36",
+                "sebastian/comparator": "^1.2.4",
+                "symfony/process": "^2.3"
             },
             "type": "composer-plugin",
             "extra": {
@@ -117,6 +120,7 @@
                 "Kanboard",
                 "Lan Management System",
                 "MODX Evo",
+                "MantisBT",
                 "Mautic",
                 "Maya",
                 "OXID",
@@ -171,6 +175,7 @@
                 "shopware",
                 "silverstripe",
                 "sydes",
+                "sylius",
                 "symfony",
                 "typo3",
                 "wordpress",
@@ -178,7 +183,21 @@
                 "zend",
                 "zikula"
             ],
-            "time": "2019-08-12T15:00:31+00:00"
+            "support": {
+                "issues": "https://github.com/composer/installers/issues",
+                "source": "https://github.com/composer/installers/tree/v1.9.0"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-04-07T06:57:05+00:00"
         },
         {
             "name": "composer/semver",
@@ -1546,12 +1565,6 @@
                 "laminas",
                 "zf"
             ],
-            "funding": [
-                {
-                    "url": "https://funding.communitybridge.org/projects/laminas-project",
-                    "type": "community_bridge"
-                }
-            ],
             "time": "2020-05-20T16:45:56+00:00"
         },
         {
@@ -3220,20 +3233,6 @@
                 "portable",
                 "shim"
             ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-05-12T16:47:27+00:00"
         },
         {
@@ -4272,16 +4271,6 @@
                 "ssl",
                 "tls"
             ],
-            "funding": [
-                {
-                    "url": "https://packagist.com",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-04-08T08:27:21+00:00"
         },
         {
@@ -6275,16 +6264,6 @@
                 "parser",
                 "validator"
             ],
-            "funding": [
-                {
-                    "url": "https://github.com/Seldaek",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/seld/jsonlint",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-04-30T19:05:18+00:00"
         },
         {