Bump terser-webpack-plugin from 3.0.4 to 3.0.6

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 3.0.4 to 3.0.6.
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/terser-webpack-plugin/compare/v3.0.4...v3.0.6)

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

package-lock.json

@@ -12867,9 +12867,9 @@
       }
     },
     "terser-webpack-plugin": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-3.0.4.tgz",
-      "integrity": "sha512-hcDwaacWj4gpWAC5+Up1spE1BulQEiLV63qN8TovDmFTEjC098vDQcO4BsO/HYKevWwisnSCy/qUNK7OUXn22Q==",
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-3.0.6.tgz",
+      "integrity": "sha512-z3HLOOPUHkCNGkeEHqqiMAIy1pjpHwS1o+i6Zn0Ws3EAvHJj46737efNNEvJ0Vx9BdDQM83d56qySDJOSORA0A==",
       "dev": true,
       "requires": {
         "cacache": "^15.0.4",
@@ -12879,7 +12879,7 @@
         "schema-utils": "^2.6.6",
         "serialize-javascript": "^4.0.0",
         "source-map": "^0.6.1",
-        "terser": "^4.6.13",
+        "terser": "^4.8.0",
         "webpack-sources": "^1.4.3"
       },
       "dependencies": {
@@ -12896,9 +12896,9 @@
           }
         },
         "ajv-keywords": {
-          "version": "3.4.1",
-          "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.4.1.tgz",
-          "integrity": "sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ==",
+          "version": "3.5.0",
+          "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.5.0.tgz",
+          "integrity": "sha512-eyoaac3btgU8eJlvh01En8OCKzRqlLe2G5jDsCr3RiE2uLGMEEB1aaGwVVpwR8M95956tGH6R+9edC++OvzaVw==",
           "dev": true
         },
         "cacache": {
@@ -13081,9 +13081,9 @@
           }
         },
         "terser": {
-          "version": "4.7.0",
-          "resolved": "https://registry.npmjs.org/terser/-/terser-4.7.0.tgz",
-          "integrity": "sha512-Lfb0RiZcjRDXCC3OSHJpEkxJ9Qeqs6mp2v4jf2MHfy8vGERmVDuvjXdd/EnP5Deme5F2yBRBymKmKHCBg2echw==",
+          "version": "4.8.0",
+          "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz",
+          "integrity": "sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==",
           "dev": true,
           "requires": {
             "commander": "^2.20.0",