[AVRO-XXX] Fix csharp dist step
[AVRO-XXX] Fix csharp dist step

(cherry picked from commit 342a8ea7f0f7603147faf035b3c04905f393ed4c)

apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro