PyIceberg 0.6.1

Patch release:

• Fail to create version 1 table with non-empty partition-spec and sort-order
• Hive Catalog cannot create table with TimestamptzType field
• Fail to read parquet file with special characters in column names
• Hive Catalog commit consistency issue
• docutils=0.21 installation issue

Full Changelog: https://github.com/apache/iceberg-python/commits/pyiceberg-0.6.1