master
s3: add Scality (RING / ARTESCA) provider
s3: add Fastly Object Storage provider
s3: update to using AWS SDK v2 - fixes #4989
s3: IBM COS: provide ibm_iam_endpoint as a configurable param for IBM IAM-based auth
s3: add HCP provider and list_versions_oldest_first quirk
s3: strip S3 Express session token on cross-host redirects GHSA-8mxv-9xhp-86h4
s3: fix mounting a prefix failing with 403 when HEAD is not permitted
s3: add multi-part-upload support for If-Match and If-None-Match