Bump System.Text.Encodings.Web from 4.6.0 to 4.7.2 in /XboxWebApi

Bumps [System.Text.Encodings.Web](https://github.com/dotnet/corefx) from 4.6.0 to 4.7.2.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

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

Author: dependabot[bot]

XboxWebApi/XboxWebApi.csproj

@@ -30,7 +30,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.3" />
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="3.1.3" />
-    <PackageReference Include="System.Text.Encodings.Web" Version="4.6.0" />
+    <PackageReference Include="System.Text.Encodings.Web" Version="4.7.2" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
   </ItemGroup>
 </Project>