build(deps): bump Selenium.WebDriver in /test/integration

Bumps [Selenium.WebDriver](https://github.com/SeleniumHQ/selenium) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Commits](SeleniumHQ/selenium@selenium-4.20.0...selenium-4.21.0)

---
updated-dependencies:
- dependency-name: Selenium.WebDriver
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Appium.Net/Appium.Net.csproj

@@ -59,7 +59,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Selenium.Support" Version="4.20.0" />
-    <PackageReference Include="Selenium.WebDriver" Version="4.20.0" />
+    <PackageReference Include="Selenium.WebDriver" Version="4.21.0" />
     <PackageReference Include="System.Drawing.Common" Version="8.0.5" />
   </ItemGroup>
   <ItemGroup>