Bump gulp-terser from 1.3.2 to 1.4.0

Bumps [gulp-terser](https://github.com/duan602728596/gulp-terser) from 1.3.2 to 1.4.0.
- [Release notes](https://github.com/duan602728596/gulp-terser/releases)
- [Commits](https://github.com/duan602728596/gulp-terser/compare/v1.3.2...v1.4.0)

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

package.json

@@ -31,7 +31,7 @@
     "gulp-run": "^1.7.1",
     "gulp-sass": "^4.0.2",
     "gulp-sourcemaps": "^2.6.5",
-    "gulp-terser": "^1.3.2",
+    "gulp-terser": "^1.4.0",
     "localtunnel": "^2.0.0",
     "lodash": "^4.17.20",
     "lodash.template": "^4.5.0",

yarn.lock

@@ -3595,10 +3595,10 @@ gulp-sourcemaps@^2.6.5:
     strip-bom-string "1.X"
     through2 "2.X"
 
-gulp-terser@^1.3.2:
-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/gulp-terser/-/gulp-terser-1.3.2.tgz#c91a71c31de0c40a94330bfd43b20c2a40df9a6b"
-  integrity sha512-hLx9Ww9PX304R3E7pMyL+jFftH47QXQCgKE6IZajbz7OoqAPMdr+sTxBpaujgIVkdbnJwJ7AFhfrcyy/cjBgZQ==
+gulp-terser@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/gulp-terser/-/gulp-terser-1.4.0.tgz#0ac4dfdbed4ab46906007c5b358810c1642b9764"
+  integrity sha512-7df9leJna3WOmj76tYHxjpn7BSU+vmKVjVSd6bz3uLEyrzCfZI97KPhRcIabrSNzs0UY/UXTt+JwkxPw3sF85w==
   dependencies:
     is-promise "^4.0.0"
     plugin-error "^1.0.1"