deps: Upgrade @expo/react-native-action-sheet to v3.8.0, the latest.

In particular, this gets us a fix for
@expo/react-native-action-sheetzulip#161, which landed in
@expo/react-native-action-sheetb20bf029e, released in v3.6.0. On RN
v0.62, which we're about to upgrade to, we'd otherwise see crashes
on Android.

package.json

@@ -31,7 +31,7 @@
     "update-libdefs": "yarn install && rm -rf flow-typed/npm/ && flow-typed update"
   },
   "dependencies": {
-    "@expo/react-native-action-sheet": "^3.4.0",
+    "@expo/react-native-action-sheet": "^3.8.0",
     "@react-native-community/async-storage": "^1.6.3",
     "@react-native-community/cameraroll": "^1.7.2",
     "@react-native-community/masked-view": "^0.1.10",

yarn.lock

@@ -1018,10 +1018,10 @@
   dependencies:
     "@types/hammerjs" "^2.0.36"
 
-"@expo/react-native-action-sheet@^3.4.0":
-  version "3.4.0"
-  resolved "https://registry.yarnpkg.com/@expo/react-native-action-sheet/-/react-native-action-sheet-3.4.0.tgz#b385b650a1296a8f7411ef3cdccbaa5aef8429d5"
-  integrity sha512-jT9ebYH3Vrf70NDgk3wGfY90UMGLweF9Eav4fuGOSEKzRCH/l/uaHZOKzeoMVua0hE4lanfL6jtcpbEjEXGP0w==
+"@expo/react-native-action-sheet@^3.8.0":
+  version "3.8.0"
+  resolved "https://registry.yarnpkg.com/@expo/react-native-action-sheet/-/react-native-action-sheet-3.8.0.tgz#0db8b70ea8550ceb2983abda8584efa3a61d7389"
+  integrity sha512-tCfwysuqy0sfaN+aA98IKUrwCLKsbDHSYLcnHrx9wNbawOHNez8rSeFtieAS48/HyrPI75yg/ZGvxe6UsJRS8Q==
   dependencies:
     "@types/hoist-non-react-statics" "^3.3.1"
     hoist-non-react-statics "^3.3.0"