Update manifest.json to remove http dependency

Author: mkanet

custom_components/plex_recently_added/manifest.json

@@ -3,7 +3,7 @@
   "name": "Plex Recently Added",
   "codeowners": ["@maykar"],
   "config_flow": true,
-  "dependencies": ["http"],
+  "dependencies": [],
   "documentation": "https://github.com/custom-components/sensor.plex_recently_added",
   "iot_class": "local_polling",
   "issue_tracker": "https://github.com/custom-components/sensor.plex_recently_added/issues",