Bump NLog.Config from 4.6.5 to 4.7.15 in /aries-backchannels/dotnet/server#887

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dependabot/nuget/aries-backchannels/dotnet/server/NLog.Config-4.7.15openwallet-foundation/owl-agent-test-harness:dependabot/nuget/aries-backchannels/dotnet/server/NLog.Config-4.7.15Copy head branch name to clipboard