[Release] Stop using SHA1 checksums per ASF policy

https://www.apache.org/dev/release-distribution#sigs-and-sums

**Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-3069) / @wesm
**Assignee**: [Krisztian Szucs](https://issues.apache.org/jira/browse/ARROW-3069) / @kszucs
#### PRs and other links:
- [GitHub Pull Request #2584](https://github.com/apache/arrow/pull/2584)

<sub>**Note**: *This issue was originally created as [ARROW-3069](https://issues.apache.org/jira/browse/ARROW-3069). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>

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[Release] Stop using SHA1 checksums per ASF policy #19426

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[Release] Stop using SHA1 checksums per ASF policy #19426

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