Bump Azure.Storage.Blobs in /FeatureFlags/FeatureFlags.Service

Bumps [Azure.Storage.Blobs](https://github.com/Azure/azure-sdk-for-net) from 12.8.1 to 12.8.3.
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Storage.Blobs_12.8.1...Azure.Storage.Blobs_12.8.3)

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

FeatureFlags/FeatureFlags.Service/FeatureFlags.Service.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.1.0" />
-    <PackageReference Include="Azure.Storage.Blobs" Version="12.8.1" />
+    <PackageReference Include="Azure.Storage.Blobs" Version="12.8.3" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.17.0" />
     <PackageReference Include="Microsoft.Azure.Cosmos.Table" Version="1.0.8" />
     <PackageReference Include="Microsoft.Azure.Services.AppAuthentication" Version="1.6.1" />