Update dependency broccoli-merge-trees to v4 (#1444)

Co-authored-by: Renovate Bot <renovatebot@gmail.com>

package.json

@@ -42,7 +42,7 @@
     "broccoli-asset-rev": "3.0.0",
     "broccoli-concat": "4.2.2",
     "broccoli-funnel": "2.0.2",
-    "broccoli-merge-trees": "3.0.2",
+    "broccoli-merge-trees": "4.1.0",
     "broccoli-uglify-sourcemap": "3.2.0",
     "chai-dom": "1.8.1",
     "codemirror": "5.48.2",

yarn.lock

@@ -2844,12 +2844,12 @@ broccoli-lint-eslint@^5.0.0:
     lodash.defaultsdeep "^4.6.0"
     md5-hex "^2.0.0"
 
-broccoli-merge-trees@3.0.2, "broccoli-merge-trees@^2.0.0 || ^3.0.0", broccoli-merge-trees@^3.0.0, broccoli-merge-trees@^3.0.1, broccoli-merge-trees@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz#f33b451994225522b5c9bcf27d59decfd8ba537d"
-  integrity sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==
+broccoli-merge-trees@4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/broccoli-merge-trees/-/broccoli-merge-trees-4.1.0.tgz#a30e2e4c5bb0f5eb8981e8af33a8077714c11f1a"
+  integrity sha512-1OXsksKPFiRdiZZOfh1z1mm7ZqKezlMS+DPBpHMDLSb6AhYHvoQfjf0KuMXbY8aoYskj7+Z+EJ5SsS/OC2v5yw==
   dependencies:
-    broccoli-plugin "^1.3.0"
+    broccoli-plugin "^3.1.0"
     merge-trees "^2.0.0"
 
 broccoli-merge-trees@^1.0.0, broccoli-merge-trees@^1.1.1, broccoli-merge-trees@^1.2.4:
@@ -2874,6 +2874,14 @@ broccoli-merge-trees@^2.0.0:
     broccoli-plugin "^1.3.0"
     merge-trees "^1.0.1"
 
+"broccoli-merge-trees@^2.0.0 || ^3.0.0", broccoli-merge-trees@^3.0.0, broccoli-merge-trees@^3.0.1, broccoli-merge-trees@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz#f33b451994225522b5c9bcf27d59decfd8ba537d"
+  integrity sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==
+  dependencies:
+    broccoli-plugin "^1.3.0"
+    merge-trees "^2.0.0"
+
 broccoli-middleware@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/broccoli-middleware/-/broccoli-middleware-2.1.1.tgz#183635bbef4dc1241533ee001a162f013d776cb9"
@@ -2993,7 +3001,7 @@ broccoli-plugin@^2.0.0, broccoli-plugin@^2.1.0:
     rimraf "^2.3.4"
     symlink-or-copy "^1.1.8"
 
-broccoli-plugin@^3.0.0:
+broccoli-plugin@^3.0.0, broccoli-plugin@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/broccoli-plugin/-/broccoli-plugin-3.1.0.tgz#54ba6dd90a42ec3db5624063292610e326b1e542"
   integrity sha512-7w7FP8WJYjLvb0eaw27LO678TGGaom++49O1VYIuzjhXjK5kn2+AMlDm7CaUFw4F7CLGoVQeZ84d8gICMJa4lA==