Update dependency gscan to v4.31.2 (#851)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -49,7 +49,7 @@
         "autoprefixer": "10.4.7",
         "beeper": "2.1.0",
         "cssnano": "5.1.12",
-        "gscan": "4.22.0",
+        "gscan": "4.31.2",
         "gulp": "4.0.2",
         "gulp-concat": "2.6.1",
         "gulp-livereload": "4.0.2",