Update dependency gscan to v5.3.1

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
         "autoprefixer": "10.4.24",
         "beeper": "2.1.0",
         "cssnano": "7.1.2",
-        "gscan": "5.2.4",
+        "gscan": "5.3.1",
         "gulp": "5.0.1",
         "gulp-concat": "2.6.1",
         "gulp-livereload": "4.0.2",