Fix a typo in metadata.template.json
diff --git a/.bcr/metadata.template.json b/.bcr/metadata.template.json
index 2a9e313..9f0e465 100644
--- a/.bcr/metadata.template.json
+++ b/.bcr/metadata.template.json
@@ -1,5 +1,5 @@
 {
-  "homepage": "https://github.com/bazelbuild/rules_cc"
+  "homepage": "https://github.com/bazelbuild/rules_cc",
   "maintainers": [],
   "versions": [],
   "yanked_versions": {}