Updated minio driver to support 7.1.xx

[madan-ram]

Hi, I have updated minio version to > 7.1.xx. Had to remove some code and changes in import in order to update minio driver version.

[scy]

In case anyone else is wondering why this PR replaces a lot of exception classes with more generic-looking ones: minio-py ≥ 7 indeed removed quite a few exception classes, see error.py in b81883a.