[SPARK-21278][PYSPARK] Upgrade to Py4J 0.10.6
## What changes were proposed in this pull request? This PR aims to bump Py4J in order to fix the following float/double bug. Py4J 0.10.5 fixes this (https://github.com/bartdag/py4j/issues/272) and the latest Py4J is 0.10.6. **BEFORE** ``` >>> df = spark.range(1) >>> df.select(df['id'] + 17.133574204226083).show() +--------------------+ |(id + 17.1335742042)| +--------------------+ | 17.1335742042| +--------------------+ ``` **AFTER** ``` >>> df = spark.range(1) >>> df.select(df['id'] + 17.133574204226083).show() +-------------------------+ |(id + 17.133574204226083)| +-------------------------+ | 17.133574204226083| +-------------------------+ ``` ## How was this patch tested? Manual. Author: Dongjoon Hyun <dongjoon@apache.org> Closes #18546 from dongjoon-hyun/SPARK-21278.
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