Allow usage of unsigned S3 client #350

Job	Run time
Integration / Integration tests (3.8, S3, s3torchconnectorcistack-cibucketdeebc8b6-cozetiwes62w, eu-north-1, ht...	8m 6s
Integration / Integration tests (3.8, S3 Express, pytorch-express-cibucket--eun1-az1--x-s3, eu-north-1, EXPRESS...	15m 31s
Integration / Integration tests (3.9, S3, s3torchconnectorcistack-cibucketdeebc8b6-cozetiwes62w, eu-north-1, ht...	8m 28s
Integration / Integration tests (3.9, S3 Express, pytorch-express-cibucket--eun1-az1--x-s3, eu-north-1, EXPRESS...	8m 23s
Integration / Integration tests (3.10, S3, s3torchconnectorcistack-cibucketdeebc8b6-cozetiwes62w, eu-north-1, h...	9m 45s
Integration / Integration tests (3.10, S3 Express, pytorch-express-cibucket--eun1-az1--x-s3, eu-north-1, EXPRES...	9m 18s
Integration / Integration tests (3.11, S3, s3torchconnectorcistack-cibucketdeebc8b6-cozetiwes62w, eu-north-1, h...	16m 8s
Integration / Integration tests (3.11, S3 Express, pytorch-express-cibucket--eun1-az1--x-s3, eu-north-1, EXPRES...	12m 30s
Integration / Integration tests (3.12, S3, s3torchconnectorcistack-cibucketdeebc8b6-cozetiwes62w, eu-north-1, h...	6m 44s
Integration / Integration tests (3.12, S3 Express, pytorch-express-cibucket--eun1-az1--x-s3, eu-north-1, EXPRES...	12m 31s
	1h 47m 24s

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