fix(api) Update serializer max length to match database (#13499)

`sentry_repository.name` is 200 bytes long. We should allow that same
length when specifying refs during release creation or repositories with
long names cannot have releases made.

Refs #13487

Author: markstory

src/sentry/api/serializers/rest_framework/release.py

@@ -16,7 +16,7 @@ class ReleaseHeadCommitSerializerDeprecated(serializers.Serializer):
 
 class ReleaseHeadCommitSerializer(serializers.Serializer):
     commit = serializers.CharField(max_length=64)
-    repository = serializers.CharField(max_length=64)
+    repository = serializers.CharField(max_length=200)
     previousCommit = serializers.CharField(max_length=64, required=False)