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Which issue does this PR close?
Closes #.
Rationale for this change
#4822 makes changes to fix clippy with the newest version of chrono, 0.4.31 but to do so it uses new features from that version of chrono (timestamp_nanos_opt()).
Thus we need to make sure arrow declares that it requires at least 0.4.31
What changes are included in this PR?
Are there any user-facing changes?