Bump uglify-js from 3.7.4 to 3.7.7 (#1871)

Bumps [uglify-js](https://github.com/mishoo/UglifyJS2) from 3.7.4 to 3.7.7.
- [Release notes](https://github.com/mishoo/UglifyJS2/releases)
- [Commits](https://github.com/mishoo/UglifyJS2/compare/v3.7.4...v3.7.7)

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

package-lock.json

@@ -17195,9 +17195,9 @@
 			}
 		},
 		"uglify-js": {
-			"version": "3.7.4",
-			"resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.7.4.tgz",
-			"integrity": "sha512-tinYWE8X1QfCHxS1lBS8yiDekyhSXOO6R66yNOCdUJeojxxw+PX2BHAz/BWyW7PQ7pkiWVxJfIEbiDxyLWvUGg==",
+			"version": "3.7.7",
+			"resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.7.7.tgz",
+			"integrity": "sha512-FeSU+hi7ULYy6mn8PKio/tXsdSXN35lm4KgV2asx00kzrLU9Pi3oAslcJT70Jdj7PHX29gGUPOT6+lXGBbemhA==",
 			"dev": true,
 			"requires": {
 				"commander": "~2.20.3",