Bump AngleSharp from 1.1.0 to 1.4.0

---
updated-dependencies:
- dependency-name: AngleSharp
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

PreMailer.Net/PreMailer.Net/PreMailer.Net.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="1.1.0" />
+    <PackageReference Include="AngleSharp" Version="1.4.0" />
   </ItemGroup>
 
   <ItemGroup>