Switch CI from minio to localstack

[gaul]

The former is now in maintenance-mode:

minio/minio@27742d4

[gaul]

@klaudworks given #940 it might be good to abandon Minio entirely. But I find that more s3-tests fail than gaul/s3-tests#5 suppressed:

FAILED s3tests_boto3/functional/test_s3.py::test_bucket_list_delimiter_whitespace - AssertionError: assert ['b', 'c'] == ['b ', 'c ']
FAILED s3tests_boto3/functional/test_s3.py::test_bucket_listv2_delimiter_whitespace - AssertionError: assert ['b', 'c'] == ['b ', 'c ']
FAILED s3tests_boto3/functional/test_s3.py::test_bucket_list_maxkeys_zero - AssertionError: assert ['bar', 'baz', 'foo', 'quxx'] == []
FAILED s3tests_boto3/functional/test_s3.py::test_bucket_listv2_maxkeys_zero - AssertionError: assert ['bar', 'baz', 'foo', 'quxx'] == []
FAILED s3tests_boto3/functional/test_s3.py::test_object_write_expires - assert datetime.datetime(2025, 12, 12, 3, 44, 14, tzinfo=<UTC>) == datetime.datetime(2025, 12, 11, 19, 44, 14, tzinfo=tzutc())
FAILED s3tests_boto3/functional/test_s3.py::test_abort_multipart_upload_not_found - AssertionError: ClientError not raised

[gaul]

Oh, of course we should ignore both the minio and localstack tags. Still two failing tests:

FAILED s3tests_boto3/functional/test_s3.py::test_bucket_list_maxkeys_zero - AssertionError: assert ['bar', 'baz', 'foo', 'quxx'] == []
FAILED s3tests_boto3/functional/test_s3.py::test_bucket_listv2_maxkeys_zero - AssertionError: assert ['bar', 'baz', 'foo', 'quxx'] == []

[klaudworks]

ye, good idea! especially given that OSS minio is retired now.