Bump Microsoft.Extensions.DependencyInjection from 3.1.4 to 3.1.5 in /src/server/MUDhub.Core#156

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dependabot/nuget/src/server/MUDhub.Core/Microsoft.Extensions.DependencyInjection-3.1.5MUDHub/MUDhub:dependabot/nuget/src/server/MUDhub.Core/Microsoft.Extensions.DependencyInjection-3.1.5Copy head branch name to clipboard