Update dependencies (#118)

* Update dependencies

Most notably: System.Io.Pipelines from 4.5.3 to 4.7.4. Also a patch bump on System.Memory, and an update to the Corvus.Testing.SpecFlow.NUnit metapackage, upgrading the tests to SpecFlow 3.6.

Also remove old Common.NetStandard_2_0.proj since it's not really needed

Author: idg10

GitVersion.yml

@@ -4,5 +4,5 @@ branches:
     regex: ^master
     tag: preview
     increment: patch
-next-version: "0.3"
+next-version: "0.4"
 

Solutions/Ais.Net.Specs/Ais.Net.Specs.csproj

@@ -10,8 +10,8 @@
     <NoWarn>RCS1029;RCS1089;SA1600;CS1591;SA1633;SA1649</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="System.Memory" Version="4.5.3" />
-    <PackageReference Include="Corvus.Testing.SpecFlow.NUnit" Version="1.1.0" />
+    <PackageReference Include="System.Memory" Version="4.5.4" />
+    <PackageReference Include="Corvus.Testing.SpecFlow.NUnit" Version="1.2.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Ais.Net\Ais.Net.csproj" />