Bump Microsoft.Azure.WebJobs.Extensions.DurableTask from 2.8.0 to 2.9.1 in /src/ServerlessPersistence#14

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dependabot/nuget/src/ServerlessPersistence/Microsoft.Azure.WebJobs.Extensions.DurableTask-2.9.1marcduiker/demos-serverless-persistence:dependabot/nuget/src/ServerlessPersistence/Microsoft.Azure.WebJobs.Extensions.DurableTask-2.9.1Copy head branch name to clipboard