70c044db8e
These were added for backwards compatibility (and essentially deprecated) in https://github.com/matrix-org/synapse/pull/7408 (2020-05-04) because [`synapse-s3-storage-provider`](https://github.com/matrix-org/synapse-s3-storage-provider) previously relied on them -- but `synapse-s3-storage-provider` since been [updated](https://github.com/matrix-org/synapse-s3-storage-provider/pull/36) to no longer use them.