Bump Newtonsoft.Json in /src/Owin.Security.Providers.StackExchange

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 8.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/8.0.3...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -7,19 +7,14 @@ GEM
       rake (~> 10)
       semver2 (~> 3.4)
     map (6.6.0)
-    mini_portile2 (2.8.1)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
-      racc (~> 1.4)
-    nokogiri (1.14.3-x64-mingw32)
-      racc (~> 1.4)
+    mini_portile2 (2.3.0)
+    nokogiri (1.8.2-x64-mingw32)
+      mini_portile2 (~> 2.3.0)
     os (1.0.0)
-    racc (1.6.2)
     rake (10.5.0)
     semver2 (3.4.2)
 
 PLATFORMS
-  ruby
   x64-mingw32
 
 DEPENDENCIES

src/Owin.Security.Providers.StackExchange/packages.config

@@ -2,6 +2,6 @@
 <packages>
   <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
   <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="Owin" version="1.0" targetFramework="net45" />
 </packages>