Update dependency Azure.Storage.Blobs to v12.21.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Azure.Storage.Blobs (source)	12.21.1 -> 12.21.2

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Release Notes

Azure/azure-sdk-for-net (Azure.Storage.Blobs)

### [`v12.21.2`](https://togithub.com/Azure/azure-sdk-for-net/releases/tag/Azure.Storage.Blobs_12.21.2) #### 12.21.2 (2024-08-08) ##### Bugs Fixed - Fixed \[BUG] WrapKeyInternal to correctly call WrapKey in sync flow [#​42160](https://togithub.com/Azure/azure-sdk-for-net/issues/42160)

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