fix(Renovate): Correct some dependency types

The npm manager considers Yarn v2+ to be of type `packageManager` rather
than `engines`, so follow that convention for asdf and Yarn v1.

Introduce the new `depType` `config` for the centralized MegaLinter and
Renovate configs as well as Yarn plugins. Use the commit scope `config`
when bumping these dependencies. The centralized MegaLinter and Renovate
configs are both governed by the same dependency, namely this repository
itself, so using different types resulted in a duplicate row in the pull
request descriptions generated by Renovate.

default.json

@@ -30,6 +30,10 @@
     "schedule": ["on the 29th day of February in 1970"]
   },
   "packageRules": [
+    {
+      "matchDepTypes": ["config"],
+      "semanticCommitScope": "config"
+    },
     {
       "matchDepTypes": ["dev-dependencies", "devDependencies"],
       "semanticCommitScope": "deps-dev"
@@ -93,7 +97,7 @@
         "github>(?<depName>ScribeMD/\\.github)#(?<currentValue>(\\d+\\.){2}\\d+)"
       ],
       "datasourceTemplate": "github-tags",
-      "depTypeTemplate": "engines"
+      "depTypeTemplate": "config"
     },
     {
       "customType": "regex",
@@ -125,7 +129,7 @@
       ],
       "packageNameTemplate": "asdf-vm/asdf",
       "datasourceTemplate": "github-tags",
-      "depTypeTemplate": "engines",
+      "depTypeTemplate": "packageManager",
       "extractVersionTemplate": "^v(?<version>.*)$"
     },
     {
@@ -145,7 +149,7 @@
       "matchStrings": ["(?<depName>yarn)\\s+(?<currentValue>(\\d+\\.){2}\\d+)"],
       "packageNameTemplate": "yarnpkg/yarn",
       "datasourceTemplate": "github-tags",
-      "depTypeTemplate": "engines",
+      "depTypeTemplate": "packageManager",
       "extractVersionTemplate": "^v(?<version>.*)$"
     },
     {
@@ -195,7 +199,7 @@
         "https://raw\\.githubusercontent\\.com/(?<depName>[^/]+/[^/]+)/v?(?<currentValue>(\\d+\\.){2}\\d+)"
       ],
       "datasourceTemplate": "github-tags",
-      "depTypeTemplate": "devDependencies",
+      "depTypeTemplate": "config",
       "extractVersionTemplate": "^v?(?<version>.*)$"
     },
     {