Bump webpack-merge from 4.2.2 to 5.2.0

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 4.2.2 to 5.2.0.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/survivejs/webpack-merge/compare/v4.2.2...v5.2.0)

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

package-lock.json

@@ -3521,6 +3521,28 @@
       "integrity": "sha1-4+JbIHrE5wGvch4staFnksrD3Fg=",
       "dev": true
     },
+    "clone-deep": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/clone-deep/-/clone-deep-4.0.1.tgz",
+      "integrity": "sha512-neHB9xuzh/wk0dIHweyAXv2aPGZIVk3pLMe+/RNzINf17fe0OG96QroktYAUm7SM1PBnzTabaLboqqxDyMU+SQ==",
+      "dev": true,
+      "requires": {
+        "is-plain-object": "^2.0.4",
+        "kind-of": "^6.0.2",
+        "shallow-clone": "^3.0.0"
+      },
+      "dependencies": {
+        "is-plain-object": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-2.0.4.tgz",
+          "integrity": "sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==",
+          "dev": true,
+          "requires": {
+            "isobject": "^3.0.1"
+          }
+        }
+      }
+    },
     "clone-response": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/clone-response/-/clone-response-1.0.2.tgz",
@@ -7445,6 +7467,12 @@
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
       "dev": true
     },
+    "isobject": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+      "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+      "dev": true
+    },
     "isstream": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
@@ -11144,6 +11172,15 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "shallow-clone": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/shallow-clone/-/shallow-clone-3.0.1.tgz",
+      "integrity": "sha512-/6KqX+GVUdqPuPPd2LxDDxzX6CAbjJehAAOKlNpqqUpAqPM6HeL8f+o3a+JsyGjn2lv0WY8UsTgUJjU9Ok55NA==",
+      "dev": true,
+      "requires": {
+        "kind-of": "^6.0.2"
+      }
+    },
     "shebang-command": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
@@ -14366,12 +14403,13 @@
       }
     },
     "webpack-merge": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.2.2.tgz",
-      "integrity": "sha512-TUE1UGoTX2Cd42j3krGYqObZbOD+xF7u28WB7tfUordytSjbWTIjK/8V0amkBfTYN4/pB/GIDlJZZ657BGG19g==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-5.2.0.tgz",
+      "integrity": "sha512-QBglJBg5+lItm3/Lopv8KDDK01+hjdg2azEwi/4vKJ8ZmGPdtJsTpjtNNOW3a4WiqzXdCATtTudOZJngE7RKkA==",
       "dev": true,
       "requires": {
-        "lodash": "^4.17.15"
+        "clone-deep": "^4.0.1",
+        "wildcard": "^2.0.0"
       }
     },
     "webpack-sources": {
@@ -14486,6 +14524,12 @@
         "string-width": "^4.0.0"
       }
     },
+    "wildcard": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/wildcard/-/wildcard-2.0.0.tgz",
+      "integrity": "sha512-JcKqAHLPxcdb9KM49dufGXn2x3ssnfjbcaQdLlfZsL9rH9wgDQjUtDxbo8NE0F6SFvydeu1VhZe7hZuHsB2/pw==",
+      "dev": true
+    },
     "window-size": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-1.1.1.tgz",

package.json

@@ -92,7 +92,7 @@
     "uglifyjs-webpack-plugin": "^2.2.0",
     "webpack": "^4.42.0",
     "webpack-cli": "^3.3.11",
-    "webpack-merge": "^4.2.2"
+    "webpack-merge": "^5.2.0"
   },
   "nyc": {
     "include": [