Bump Microsoft.Build.Utilities.Core from 18.4.0 to 18.6.3 (#80)

Author: dependabot[bot]

Directory.Packages.props

@@ -14,7 +14,7 @@
     <PackageVersion Include="Microsoft.AspNet.WebApi.Core" Version="5.3.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.7" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.7" />
-    <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="18.4.0" />
+    <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="18.6.3" />
     <!--
       Be careful to update this package, because it might require a newer version of the compiler:
       The analyzer assembly 'Dibix.Testing.Generators.dll' references version '4.11.0.0' of the compiler, which is newer than the currently running version '4.8.0.0'.