chore(deps): Bump Azure.Storage.Blobs from 12.20.0 to 12.21.0

Bumps [Azure.Storage.Blobs](https://github.com/Azure/azure-sdk-for-net) from 12.20.0 to 12.21.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Storage.Blobs_12.20.0...Azure.Storage.Blobs_12.21.0)

---
updated-dependencies:
- dependency-name: Azure.Storage.Blobs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/SegregatedStorage.AzureStorageProvider/SegregatedStorage.AzureStorageProvider.csproj

@@ -23,7 +23,7 @@
         <ProjectReference Include="..\SegregatedStorage\SegregatedStorage.csproj"/>
     </ItemGroup>
     <ItemGroup>
-        <PackageReference Include="Azure.Storage.Blobs" Version="12.20.0" />
+        <PackageReference Include="Azure.Storage.Blobs" Version="12.21.0" />
     </ItemGroup>
 
 </Project>