Update npm dependencies of tgui (#44588)

* Run npm audit fix

* Remove deprecated gulp-cssnano

* Use a non-alpha gulp 4.0

* Compile tgui

tgui/gulp/css.js

@@ -17,10 +17,10 @@ export function css () {
       s.opacity,
       s.rgba({oldie: true}),
       s.plsfilters({oldIE: true}),
-      s.fontweights
+      s.fontweights,
+      f.min ? s.cssnano() : false,
     ]))
     .pipe(g.bytediff.start())
-    .pipe(g.if(f.min, g.cssnano({autoprefixer: false})))
     .pipe(g.if(f.debug, g.sourcemaps.write()))
     .pipe(g.bytediff.stop())
     .pipe(gulp.dest(f.dest))

tgui/gulp/plugins.js

@@ -16,5 +16,6 @@ export const postcss = {
   gradient: require('postcss-filter-gradient'),
   opacity: require('postcss-opacity'),
   plsfilters: require('pleeease-filters'),
-  rgba: require('postcss-color-rgba-fallback')
+  rgba: require('postcss-color-rgba-fallback'),
+  cssnano: require('cssnano'),
 }

tgui/package.json

@@ -18,15 +18,15 @@
     "browserify": "13.0.0",
     "bundle-collapser": "1.2.1",
     "cached-path-relative": "1.0.2",
+    "cssnano": "^4.1.10",
     "dom4": "1.7.0",
     "es3ify": "0.2.1",
     "fg-loadcss": "1.0.0-0",
     "fontfaceobserver": "1.6.3",
-    "gulp": "git://github.com/gulpjs/gulp.git#v4.0.0-alpha.3",
+    "gulp": "^4.0.2",
     "gulp-bytediff": "1.0.0",
-    "gulp-cssnano": "2.1.2",
     "gulp-if": "2.0.0",
-    "gulp-load-plugins": "1.5.0",
+    "gulp-load-plugins": "^1.6.0",
     "gulp-postcss": "6.1.0",
     "gulp-size": "2.0.0",
     "gulp-sourcemaps": "1.6.0",
@@ -52,7 +52,7 @@
     "stylus": "0.54.5",
     "vinyl-buffer": "1.0.1",
     "vinyl-source-stream": "2.0.0",
-    "watchify": "3.7.0"
+    "watchify": "^3.11.1"
   },
   "browser": {
     "ractive": "ractive/ractive-legacy.runtime"