Release arrow-rs / parquet Minor version `56.1.0` (August 2025)

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Let's keep the code flowing. Part of

• [EPIC] A collection of release tickets #7392

Release Checklist:

• Verify with downstream DataFusion tests:
• Release notes and bump version:
• Release Candidate + Vote thread:
• Release to crates.io / approval:
• Create follow on tickets

Requested items for release

• Update the parquet thrift definitions #7567