Bump Microsoft.AspNetCore.App from 2.1.2 to 2.1.15 in /Customer#4

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dependabot/nuget/Customer/Microsoft.AspNetCore.App-2.1.15canertosuner/Asp.Net-Core-Entity-Framework-Integration-Test-and-Unit-Test-Using-In-Memory-Database:dependabot/nuget/Customer/Microsoft.AspNetCore.App-2.1.15Copy head branch name to clipboard