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GH-45305: [CI] Bump Minio version and unpin boto3 (#45320)

### What changes are included in this PR?

Use latest Minio server release, which includes a fix for https://github.com/minio/minio/issues/20845

This allows us to remove the boto3 version constraint.

### Are these changes tested?

Yes, by existing CI tests.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #45305

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>