upgrade to socket.io 0.9.19-overleaf-5

fix for exception in client.transport getter

services/real-time/package-lock.json

@@ -6028,8 +6028,8 @@
       }
     },
     "socket.io": {
-      "version": "https://github.com/overleaf/socket.io/archive/0.9.19-overleaf-4.tar.gz",
-      "integrity": "sha512-jWgdvVEbPioarWhfKvmtFf9miv/TYMePwrWO+r3WlVF+07nPkWY+OK0y0Lob5shC/dTLqwyG9ajw49+ObC8s/A==",
+      "version": "https://github.com/overleaf/socket.io/archive/0.9.19-overleaf-5.tar.gz",
+      "integrity": "sha512-MDRh05EWE7OSgLzsFR0ikLzIVxPD7ItC5FcScxY58QYTRmC4p0kbod4zVSYjIT9aTdMM6CnWXMvFYSe50vV/iA==",
       "requires": {
         "base64id": "0.1.0",
         "policyfile": "0.0.4",

services/real-time/package.json

@@ -35,7 +35,7 @@
     "logger-sharelatex": "^2.2.0",
     "request": "^2.88.2",
     "settings-sharelatex": "^1.1.0",
-    "socket.io": "https://github.com/overleaf/socket.io/archive/0.9.19-overleaf-4.tar.gz",
+    "socket.io": "https://github.com/overleaf/socket.io/archive/0.9.19-overleaf-5.tar.gz",
     "socket.io-client": "https://github.com/overleaf/socket.io-client/archive/0.9.17-overleaf-3.tar.gz",
     "underscore": "1.13.1"
   },