Update @expo/config-plugins to v9

Author: zoontek

example/Gemfile.lock

@@ -78,9 +78,9 @@ GEM
     httpclient (2.8.3)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    json (2.8.1)
+    json (2.8.2)
     logger (1.6.1)
-    minitest (5.25.1)
+    minitest (5.25.2)
     molinillo (0.8.0)
     nanaimo (0.3.0)
     nap (1.1.0)