deps: update react-native-background-timer

ios/Podfile.lock

   - ObjectiveDropboxOfficial (3.9.2)
   - React (0.57.8):
     - React/Core (= 0.57.8)
-  - react-native-background-timer (2.0.0):
+  - react-native-background-timer (2.1.1):
     - React
   - react-native-calendar-events (1.6.4):
     - React
   GTMSessionFetcher: 32aeca0aa144acea523e1c8e053089dec2cb98ca
   ObjectiveDropboxOfficial: aa792e0556ceb7b72955fa29a2709072f6e35fd9
   React: 1fe0eb13d90b625d94c3b117c274dcfd2e760e11
-  react-native-background-timer: 63dcbf37dbcf294b5c6c071afcdc661fa06a7594
+  react-native-background-timer: bb7a98c8e97fc7c290de2d423dd09ddb73dcbcbb
   react-native-calendar-events: fe6fbc8ed337a7423c98f2c9012b25f20444de09
   react-native-fast-image: cba3d9bf9c2cf8ddb643d887a686c53a5dd90a2c
   react-native-keep-awake: 0de4bd66de0c23178107dce0c2fcc3354b2a8e94

package-lock.json

       }
     },
     "react-native-background-timer": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/react-native-background-timer/-/react-native-background-timer-2.0.0.tgz",
-      "integrity": "sha512-vLNJIedXQZN4p3ChFsAgVHacnJqQMnLl+wBsnZuliRkmsjEHo8kQOA9fnLih/OoiDi1O3eHQvXC5L8f+RYiKgw=="
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/react-native-background-timer/-/react-native-background-timer-2.1.1.tgz",
+      "integrity": "sha512-cuXIIv+dcG8a8qkTD8pMzeqOEZCO+UGKglZWIe1osve+yJslmCowYQff+bI9xa7NOt2w+Vtd4L3d9JonlSqODg=="
     },
     "react-native-calendar-events": {
       "version": "1.6.4",

package.json

     "react-i18next": "7.13.0",
     "react-linkify": "0.2.2",
     "react-native": "0.57.8",
-    "react-native-background-timer": "2.0.0",
+    "react-native-background-timer": "2.1.1",
     "react-native-calendar-events": "1.6.4",
     "react-native-callstats": "3.53.4",
     "react-native-fast-image": "5.1.1",