Bump Microsoft.AspNetCore.App from 2.1.5 to 2.1.15 in /presentations/exceptionless/coredemo#4

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dependabot/nuget/presentations/exceptionless/coredemo/Microsoft.AspNetCore.App-2.1.15exceptionless/MediaKit:dependabot/nuget/presentations/exceptionless/coredemo/Microsoft.AspNetCore.App-2.1.15Copy head branch name to clipboard