[Security] Bump handlebars from 4.3.0 to 4.6.0 in /build

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.3.0 to 4.6.0. **This update includes a security fix.**
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.0...v4.6.0)

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

build/package-lock.json

@@ -2298,9 +2298,9 @@
       "dev": true
     },
     "handlebars": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.3.0.tgz",
-      "integrity": "sha512-7XlnO8yBXOdi7AzowjZssQr47Ctidqm7GbgARapOaqSN9HQhlClnOkR9HieGauIT3A8MBC6u9wPCXs97PCYpWg==",
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.6.0.tgz",
+      "integrity": "sha512-i1ZUP7Qp2JdkMaFon2a+b0m5geE8Z4ZTLaGkgrObkEd+OkUKyRbRWw4KxuFCoHfdETSY1yf9/574eVoNSiK7pw==",
       "dev": true,
       "requires": {
         "neo-async": "^2.6.0",
@@ -4963,9 +4963,9 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.9.1",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.1.tgz",
-      "integrity": "sha512-JUPoL1jHsc9fOjVFHdQIhqEEJsQvfKDjlubcCilu8U26uZ73qOg8VsN8O1jbuei44ZPlwL7kmbAdM4tzaUvqnA==",
+      "version": "3.9.3",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.3.tgz",
+      "integrity": "sha512-r5ImcL6QyzQGVimQoov3aL2ZScywrOgBXGndbWrdehKoSvGe/RmiE5Jpw/v+GvxODt6l2tpBXwA7n+qZVlHBMA==",
       "dev": true,
       "optional": true,
       "requires": {

build/package.json

@@ -11,7 +11,7 @@
   "contributors": [],
   "dependencies": {},
   "devDependencies": {
-    "handlebars": "^4.3.0",
+    "handlebars": "^4.6.0",
     "jasmine-core": "~2.5.2",
     "jasmine-sinon": "^0.4.0",
     "jsdoc": "^3.6.3",