Bump Appium.WebDriver from 5.2.0 to 6.0.0 in /src

Bumps [Appium.WebDriver](https://github.com/appium/dotnet-client) from 5.2.0 to 6.0.0.
- [Release notes](https://github.com/appium/dotnet-client/releases)
- [Changelog](https://github.com/appium/dotnet-client/blob/main/CHANGELOG.MD)
- [Commits](appium/dotnet-client@v5.2.0...v6.0.0)

---
updated-dependencies:
- dependency-name: Appium.WebDriver
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/FlaUI.WebDriver.UITests/FlaUI.WebDriver.UITests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Appium.WebDriver" Version="5.2.0" />
+    <PackageReference Include="Appium.WebDriver" Version="6.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />