v1.5.7-beta.67

From newest to oldest:

• Refactored SubDL provider by simplifying retry logic and improving error handling for rate limits and 404 responses. 047b915
• Removed RateLimiting mixin from TimeoutSession in subliminal_patch HTTP module since it was interfering with providers' custom rate-limiting implementations. 7343b1d
• Improved audio languages detection when the returned value is a string instead of a language object e677246
• Added CaptchaAI as an anti-captcha provider 8e4563f