Fix comma placement in SUPPORTED_ADMIN_VERSIONS array

Author: lizkenyon

lib/shopify_api/admin_versions.rb

@@ -7,7 +7,7 @@ module AdminVersions
 
     SUPPORTED_ADMIN_VERSIONS = T.let([
       "unstable",
-      "2025-07"
+      "2025-07",
       "2025-04",
       "2025-01",
       "2024-10",