Remove dependency on url-regex (#6468)

This addresses a security vulnerability. Unfortunately, we need to
force a newer version of resize-img ignoring our
dependencies. However, that seems to work fine based on my
testing (running navigator on quickstart-java and looking at
favicons).

changelog_begin
changelog_end

navigator/frontend/package.json

@@ -86,6 +86,7 @@
   "resolutions": {
     "**/@types/react": "~16.0.0",
     "**/apollo-client": "~1.4.0",
-    "**/elliptic": "^6.5.3"
+    "**/elliptic": "^6.5.3",
+    "**/resize-img": "^2.0.0"
   }
 }