chore(v4.6.x): release 4.6.6

[shaka-bot]

🤖 I have created a release beep boop

4.6.6 (2024-01-08)

Bug Fixes

• APL set-top box wrongly identifies as an Apple device. (#6026) (ca751a1)
• avoid uiTextDisplayer.destroy crashing if called more than once (#6022) (bb4f88b)
• ENCRYPTED CONTENT WITHOUT DRM INFO on comcast X1 due to safari blocklist (#6034) (a75f6bc)
• Fix untrusted types in MediaTailorAdManager (#5996) (18891ea)
• HLS: Fix clear init segment mapping (#6000) (61d5298)
• log prefetch miss for missing segments (#6012) (1528eef)
• UI: Fix disable PiP when using documentPictureInPicture (#5992) (521bbe2)

Performance Improvements

• mp4generator: stop nesting concat in methods (#6041) (2bc303b)
• transmuxer: various performance improvements (#6003) (dd8e507)
• ts parser O(n^2) performance bug. (#6035) (d3081f6)

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[shaka-bot]

🤖 Release is at https://github.com/shaka-project/shaka-player/releases/tag/v4.6.6 🌻