Changes

• Bump the minimum supported Rust version to 1.66.1
• Bump dependencies
• When possible, return full URLs for images in Atom feeds (thanks @davidcornu !)
• Support RFC1123 date format
• Update API doc for quick-xml switch (thanks @rillian !)
• Expand documentation on summary field
• Appends time (midnight) and timezone (utc) if missing from RFC 3339 timestamps (thanks @SethFalco !)
• Fix decoding regression in RSS1.0 (thanks for the always amazing bug report @jangernert !)
• Whitespace around text, IDs and links is now trimmed automatically
• Use DublinCore date element to set published date (thanks @fundon !)