4.20.8 - Update logging options, WebRTC preferences, and link-checking methods

Update logging options, WebRTC preferences, and link-checking methods

• Add more options for capturing CDP logs
  --> This resolves #2220
• Update WebRTC preferences
  --> This resolves #2218
  --> This resolves #2217
• Fix link-checking methods
  --> This resolves #2219
• Refresh Python dependencies

What's Changed

• Update logging options, WebRTC preferences, and link-checking methods by @mdmintz in #2221

Full Changelog: v4.20.7...v4.20.8