Bump System.Text.Encodings.Web

Bumps [System.Text.Encodings.Web](https://github.com/dotnet/corefx) from 4.4.0 to 4.5.1.
- [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]

Demos/src/Aspose.Tasks.Cloud.Live.Demos.UI/packages.config

@@ -50,7 +50,7 @@
   <package id="System.Numerics.Vectors" version="4.4.0" targetFramework="net471" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.2" targetFramework="net471" />
   <package id="System.Text.Encoding.CodePages" version="4.5.0" targetFramework="net471" />
-  <package id="System.Text.Encodings.Web" version="4.4.0" targetFramework="net471" />
+  <package id="System.Text.Encodings.Web" version="4.5.1" targetFramework="net471" />
   <package id="System.Threading.Tasks.Extensions" version="4.5.2" targetFramework="net471" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net471" />
   <package id="WebGrease" version="1.6.0" targetFramework="net471" />