Bump HtmlAgilityPack from 1.11.72 to 1.12.4 (#848)

Updated
[HtmlAgilityPack](https://github.com/zzzprojects/html-agility-pack/)
from 1.11.72 to 1.12.4.

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Directory.Packages.props

@@ -23,7 +23,7 @@
     <PackageVersion Include="Microsoft.ApplicationInsights.Profiler.AspNetCore" Version="2.6.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
-    <PackageVersion Include="HtmlAgilityPack" Version="1.11.72" />
+    <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
     <PackageVersion Include="IntelliTect.Multitool" Version="1.5.3" />
     <PackageVersion Include="Mailjet.Api" Version="3.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Authentication.MicrosoftAccount" Version="8.0.12" />