Updates nuget packages.

Author: jcasale

src/PSSerilog/PSSerilog.csproj

@@ -8,14 +8,14 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.PowerShell.5.1.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
-    <PackageReference Include="Serilog" Version="3.0.1" />
-    <PackageReference Include="Serilog.Enrichers.Environment" Version="2.2.0" />
+    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog.Enrichers.Environment" Version="2.3.0" />
     <PackageReference Include="Serilog.Enrichers.GlobalLogContext" Version="3.0.0" />
     <PackageReference Include="Serilog.Enrichers.Process" Version="2.0.2" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="3.1.0" />
-    <PackageReference Include="Serilog.Expressions" Version="3.4.1" />
+    <PackageReference Include="Serilog.Expressions" Version="4.0.0" />
     <PackageReference Include="Serilog.Sinks.Async" Version="1.5.0" />
-    <PackageReference Include="Serilog.Sinks.Console" Version="4.1.0" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="5.0.0" />
     <PackageReference Include="Serilog.Sinks.Email" Version="2.4.0" />
     <PackageReference Include="Serilog.Sinks.EventLog" Version="3.1.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />