Bump serve from 11.3.0 to 11.3.1 (twbs#30904)

Bumps [serve](https://github.com/zeit/serve) from 11.3.0 to 11.3.1.
- [Release notes](https://github.com/zeit/serve/releases)
- [Commits](vercel/serve@11.3.0...11.3.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

package.json

@@ -131,7 +131,7 @@
     "postcss-cli": "^7.1.1",
     "rollup": "^2.10.9",
     "rollup-plugin-istanbul": "^2.0.1",
-    "serve": "^11.3.0",
+    "serve": "^11.3.1",
     "shelljs": "^0.8.4",
     "stylelint": "^13.5.0",
     "stylelint-config-twbs-bootstrap": "^2.0.2",