Mono: Update Newtonsoft.Json to 13.0.1

See https://github.com/advisories/GHSA-5crp-9r3c-p9vr

(cherry picked from commit 870c02143b71721cc5b4f98e0dec55e63f04f408)

modules/mono/editor/GodotTools/GodotTools.IdeMessaging.CLI/GodotTools.IdeMessaging.CLI.csproj

@@ -12,6 +12,6 @@
     <ProjectReference Include="..\GodotTools.IdeMessaging\GodotTools.IdeMessaging.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
 </Project>

modules/mono/editor/GodotTools/GodotTools.IdeMessaging/GodotTools.IdeMessaging.csproj

@@ -19,6 +19,6 @@ A client using this library is only compatible with servers of the same major ve
     </Description>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
 </Project>

modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="GodotTools.IdeMessaging" Version="1.1.1" />
     <PackageReference Include="JetBrains.Annotations" Version="2019.1.3.0" ExcludeAssets="runtime" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="Mono.Cecil" Version="0.11.3" />
     <Reference Include="GodotSharp">
       <HintPath>$(GodotApiAssembliesDir)/GodotSharp.dll</HintPath>