Bumps [azure-storage-blob](https://github.com/Azure/azure-sdk-for-python) from 12.5.0 to 12.8.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Commits](Azure/azure-sdk-for-python@azure-storage-blob_12.5.0...azure-storage-blob_12.8.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>