Update dependency bootstrap to v5 [SECURITY]

Author: renovate[bot]

amp-pwa/package.json

@@ -11,7 +11,7 @@
     "sw-precache": "5.2.1"
   },
   "dependencies": {
-    "bootstrap": "4.2.1",
+    "bootstrap": "5.0.0",
     "react": "16.7.0",
     "react-bootstrap": "0.32.4",
     "react-dom": "16.7.0",