Bump expo-dev-client from 4.0.18 to 4.0.21

Bumps [expo-dev-client](https://github.com/expo/expo/tree/HEAD/packages/expo-dev-client) from 4.0.18 to 4.0.21.
- [Changelog](https://github.com/expo/expo/blob/main/packages/expo-dev-client/CHANGELOG.md)
- [Commits](https://github.com/expo/expo/commits/HEAD/packages/expo-dev-client)

---
updated-dependencies:
- dependency-name: expo-dev-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -30,7 +30,7 @@
     "expo": "^51.0.14",
     "expo-camera": "~15.0.11",
     "expo-constants": "~16.0.2",
-    "expo-dev-client": "~4.0.18",
+    "expo-dev-client": "~4.0.21",
     "expo-document-picker": "~12.0.2",
     "expo-file-system": "~17.0.1",
     "expo-font": "~12.0.4",