PARQUET-2462: Bump to Thrift 0.20.0

[Fokko]

Make sure you have checked all steps below.

0.20.0 comes with Homebrew.

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[wgtmac]

Do we need to make sure parquet-mr and parquet-format has same version of thrift? parquet-mr 1.14.0 release will go with parquet-format 2.10.0 which is still on an older version.

[Fokko]

@wgtmac Great question, I think the versions can be different, but I'm happy to defer this PR until 1.14.0 has been released.

[wgtmac]

Both ways are fine to me. Feel free to merge it at any time.