fix: Remove duplicate key time_partitioning from Table._PROPERTY_TO_A… (#1898)

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Author: toransahu

google/cloud/bigquery/table.py

@@ -385,7 +385,6 @@ class Table(_TableBase):
  "clone_definition": "cloneDefinition",
  "streaming_buffer": "streamingBuffer",
  "self_link": "selfLink",
- "time_partitioning": "timePartitioning",
  "type": "type",
  "view_use_legacy_sql": "view",
  "view_query": "view",