Hotfix installation

Please make sure you consult the page Hotfix Installation Notes for any additional actions needed to complete the installation.

Main correction(s) provided

• OpenSearch audit backend now reads legacy log entries whose stored JSON had a missing or null "entity-type".
• Stop persisting null values in dc:contributors.

Improvement(s)

• Benchmark now uses a Versity S3 gateway
• S3BlobStore async read and write paths now unwrap CompletionException so callers consistently receive the underlying SdkException as the effective cause.
• Two new nuxeo.conf properties — nuxeo.s3storage.syncDownload and nuxeo.s3storage.syncUpload — allow switching blob downloads and/or uploads to the synchronous Apache HTTP client to work around hangs with S3-compatible gateways.