[Release][Rust] Fix arrow-flight's version in datafusion crate

[asfimport]

Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson

PRs and other links:

• GitHub Pull Request #6383

_{Note: This issue was originally created as ARROW-7797. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 6383
#6383