Bump HtmlAgilityPack from 1.11.67 to 1.11.71 in /dotnet

Bumps [HtmlAgilityPack](https://github.com/zzzprojects/html-agility-pack) from 1.11.67 to 1.11.71.
- [Release notes](https://github.com/zzzprojects/html-agility-pack/releases)
- [Commits](https://github.com/zzzprojects/html-agility-pack/commits/v1.11.71)

---
updated-dependencies:
- dependency-name: HtmlAgilityPack
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

dotnet/Directory.Packages.props

@@ -29,7 +29,7 @@
     <PackageVersion Include="Handlebars.Net.Helpers" Version="2.4.6" />
     <PackageVersion Include="Markdig" Version="0.37.0" />
     <PackageVersion Include="Handlebars.Net" Version="2.1.6" />
-    <PackageVersion Include="HtmlAgilityPack" Version="1.11.67" />
+    <PackageVersion Include="HtmlAgilityPack" Version="1.11.71" />
     <PackageVersion Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
     <PackageVersion Include="JsonSchema.Net" Version="5.4.2" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker" Version="1.20.1" />