Bump staticify from 3.3.4 to 4.0.0

Bumps [staticify](https://github.com/errorception/staticify) from 3.3.4 to 4.0.0.
- [Release notes](https://github.com/errorception/staticify/releases)
- [Commits](errorception/staticify@v3.3.4...v4.0.0)

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

package.json

@@ -49,7 +49,7 @@
     "semver": "^7.1.1",
     "serve-favicon": "^2.5.0",
     "sri-toolbox": "^0.2.0",
-    "staticify": "^3.3.4",
+    "staticify": "^4.0.0",
     "uuid": "^3.3.3"
   },
   "devDependencies": {