v2.56.0

✨ New Features

• e83c7d7 - add StoredObject metadata layer. Phase 5 redo (PR #4270 by @rpcross)

🐛 Bug Fixes

• f683c2f - handle import same message-id different content (PR #4267 by @rpcross)
• 6e4b46e - fix stale checksum bug on overwrite Blob (PR #4271 by @rpcross)

🔧 Chores

• dba050d - deps: update boto3 requirement from >=1.43.93 to >=1.43.97 (PR #4272 by @dependabot[bot])
• 41e107e - deps: bump django-bootstrap5 from 26.2 to 26.3 (PR #4273 by @dependabot[bot])
• 8c63ddb - deps: bump django-debug-toolbar from 7.1.1 to 8.0.0 (PR #4274 by @dependabot[bot])
• e2febfb - deps-dev: bump sass in /frontend in the npm group (PR #4277 by @dependabot[bot])
• 63082ca - deps: update boto3-stubs requirement from >=1.43.93 to >=1.43.98 (PR #4276 by @dependabot[bot])
• 7ca9071 - deps: update botocore requirement from >=1.43.77 to >=1.43.98 (PR #4275 by @dependabot[bot])