deps: update react-native-fast-image (#3411)

Fixes a memory leak in Android: https://github.com/DylanVann/react-native-fast-image/pull/214

We are using our fork which is 4.0.14 + the leak fix because the last version
(5.0.3 at the time of this writing) contains a bug that prevents us for using
it: https://github.com/DylanVann/react-native-fast-image/issues/208

package-lock.json

       }
     },
     "react-native-fast-image": {
-      "version": "4.0.14",
-      "resolved": "https://registry.npmjs.org/react-native-fast-image/-/react-native-fast-image-4.0.14.tgz",
-      "integrity": "sha512-MeRgL70JxoY/hn8ZRGBsDED9SGvTEeznneL//fWZyLaG0CM+w2CH4QXAMvADnIvu2RFd8WQWNii6c6VOpVe4Tg==",
+      "version": "github:jitsi/react-native-fast-image#1f8c93a5584869848d75cc9b946beb9688efe285",
+      "from": "github:jitsi/react-native-fast-image#1f8c93a5584869848d75cc9b946beb9688efe285",
       "requires": {
         "prop-types": "^15.5.10"
       }

package.json

     "react-native-background-timer": "2.0.0",
     "react-native-calendar-events": "github:wmcmahan/react-native-calendar-events#cb2731db6684a49b4343e09de7f9c2fcc68bcd9b",
     "react-native-callstats": "3.52.0",
-    "react-native-fast-image": "4.0.14",
+    "react-native-fast-image": "github:jitsi/react-native-fast-image#1f8c93a5584869848d75cc9b946beb9688efe285",
     "react-native-immersive": "1.1.0",
     "react-native-keep-awake": "2.0.6",
     "react-native-linear-gradient": "2.4.0",