Bump Appium.WebDriver and Selenium.WebDriver in /src

Bumps [Appium.WebDriver](https://github.com/appium/dotnet-client) and [Selenium.WebDriver](https://github.com/SeleniumHQ/selenium). These dependencies needed to be updated together.

Updates `Appium.WebDriver` from 6.0.1 to 7.0.0
- [Release notes](https://github.com/appium/dotnet-client/releases)
- [Changelog](https://github.com/appium/dotnet-client/blob/main/CHANGELOG.MD)
- [Commits](appium/dotnet-client@v6.0.1...v7.0.0)

Updates `Selenium.WebDriver` from 4.27.0 to 4.27.0
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Commits](SeleniumHQ/selenium@selenium-4.27.0...selenium-4.27.0)

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

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="6.0.1" />
+    <PackageReference Include="Appium.WebDriver" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NUnit" Version="4.3.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />