Migrate usage of deprecated Microsoft.Azure.Storage SDKs

[jviau]

Our tests rely on deprecated Microsoft.Azure.Storage SDKs (transient reference through:

azure-functions-host/test/WebJobs.Script.Tests.Integration/WebJobs.Script.Tests.Integration.csproj

Line 46 in 1bf0813

<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="4.0.5-11874" />

(this should be updated to v5)