Bump azure-storage-blob from 12.30.3 to 12.31.0 in /backend/app

[dependabot]

Bumps azure-storage-blob from 12.30.3 to 12.31.0.

Release notes

Sourced from azure-storage-blob's releases.

azure-storage-blob_12.31.0

12.31.0 (2026-09-30)

This version and all future versions will require Python 3.10+. Python 3.9 is no longer supported.

Features Added

• Stable release of features from 12.31.0b1
• Added list support to BlobSasPermissions for use with directory-scoped SAS tokens.

Bugs Fixed

• Fixed an issue where destination_snapshot on a blob's copy properties was always None when listing blobs with response_format="arrow".

Commits

• 0be3312 2026-09-29 -> 2026-09-30 changelog entries
• 9c0768f [Storage] Prep for STG104 GA Release (#49263)
• a124f0e [Storage] Add 12.30.3 bug fix to release branch (#49140)
• 329cc23 reject headers with \r or \n (#49070)
• 7e753be [Storage] Prepare STG 104 GA release (#48791)
• 9733992 [Storage] Update main CHANGELOG after patch (#48783)
• bdef02f added headers to redirect cleanup logic (#48771)
• f020094 [Storage] Mark rehydrate to smart tier tests as playback (#48712)
• 65d40b8 fixed sample error (#48687)
• 8c46d45 [Storage] Detect region reorder during Blob decryption (#48559)
• Additional commits viewable in compare view

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