Bump handlebars from 4.5.3 to 4.7.3 in /build

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.5.3 to 4.7.3.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.5.3...v4.7.3)

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

build/package-lock.json

@@ -2174,9 +2174,9 @@
       "dev": true
     },
     "handlebars": {
-      "version": "4.5.3",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.5.3.tgz",
-      "integrity": "sha512-3yPecJoJHK/4c6aZhSvxOyG4vJKDshV36VHp0iVCDVh7o9w2vwi3NSnL2MMPj3YdduqaBcu7cGbggJQM0br9xA==",
+      "version": "4.7.3",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.3.tgz",
+      "integrity": "sha512-SRGwSYuNfx8DwHD/6InAPzD6RgeruWLT+B8e8a7gGs8FWgHzlExpTFMEq2IA6QpAfOClpKHy6+8IqTjeBCu6Kg==",
       "dev": true,
       "requires": {
         "neo-async": "^2.6.0",
@@ -4734,9 +4734,9 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.6.9",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.9.tgz",
-      "integrity": "sha512-pcnnhaoG6RtrvHJ1dFncAe8Od6Nuy30oaJ82ts6//sGSXOP5UjBMEthiProjXmMNHOfd93sqlkztifFMcb+4yw==",
+      "version": "3.8.0",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.8.0.tgz",
+      "integrity": "sha512-ugNSTT8ierCsDHso2jkBHXYrU8Y5/fY2ZUprfrJUiD7YpuFvV4jODLFmb3h4btQjqr5Nh4TX4XtgDfCU1WdioQ==",
       "dev": true,
       "optional": true,
       "requires": {

build/package.json

@@ -11,7 +11,7 @@
   "contributors": [],
   "dependencies": {},
   "devDependencies": {
-    "handlebars": "^4.5.3",
+    "handlebars": "^4.7.3",
     "jasmine-core": "~2.5.2",
     "jasmine-sinon": "^0.4.0",
     "jsdoc": "^3.6.3",