paket: fix build by requiring new MSBuild.StructuredLogger

AppVeyor was failing[1] with (which seemed to be same issue as
this one: [2]):

Script reported an error:
-> BuildFailedException: Target 'Build' failed.
-> One or more errors occurred. (Unsupported log file format. Latest supported version is 9, the log file has version 13.)
-> NotSupportedException: Unsupported log file format. Latest supported version is 9, the log file has version 13

[1] https://ci.appveyor.com/project/sergey-tihon/fsharpx-collections/builds/40656359
[2] fsprojects/FAKE#2595

paket.dependencies

@@ -8,6 +8,7 @@ nuget Expecto.FsCheck
 nuget FsCheck
 nuget Microsoft.NET.Test.Sdk
 nuget YoloDev.Expecto.TestSdk
+nuget MSBuild.StructuredLogger >= 2.1.545
 
 group Formatting
 source https://api.nuget.org/v3/index.json