Update packages to latest versions

Author: atifaziz

src/DocoptNet/DocoptNet.csproj

@@ -76,7 +76,7 @@ Portions Copyright (C) West Wind Technologies, 2008.
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.2">
+    <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>

tests/DocoptNet.Tests/DocoptNet.Tests.csproj

@@ -28,11 +28,11 @@
     <PackageReference Include="Basic.Reference.Assemblies" Version="1.4.1" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.10.0" />
     <PackageReference Include="morelinq" Version="3.3.2" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="nunit" Version="3.13.2" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+    <PackageReference Include="nunit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
-    <PackageReference Include="Shouldly" Version="4.0.3" />
+    <PackageReference Include="Shouldly" Version="4.1.0" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>