chore(v4.6.x): release 4.6.18

[shaka-bot]

🤖 I have created a release beep boop

4.6.18 (2024-05-07)

Bug Fixes

• Ads: Fix ad pausing when using customPlayheadTracker (#6444) (0bbdb00)
• call to load in MediaElement using src= in HLS Safari (#6478) (96bc67e)
• clear listeners when resetting media source (#6449) (d84a794)
• DASH: decrease memory preasure on manifest with SegmentReference by updating old initSegmentReference (#6499) (4df22d2)
• DASH: Fix get partial current position for LL when using SegmentTemplate@duration (#6516) (136befa)
• Do not make LICENSE_REQUEST_FAILED fatal if other keys are successful (#6457) (69e58f7)
• Don't update captions when video is paused (#6474) (cd4b692)
• Fix duplicate init segment download when using startAtSegmentBoundary (#6479) (b94c94a)
• Fix exceptions in StreamingEngine when reloading (#6466) (6505d1a)
• Fix flac detection in Safari (#6497) (5809c1c)
• Fix reusing region elements in UITextDisplayer (#6476) (c753a72)
• Fix seeking timeouts (#6539) (f81908f), closes #5202
• Fix support of getAllThumbnails when using DASH multi-period (#6464) (1aa29a2)
• Fix uncaught global OBJECT_DESTROYED errors (#6460) (08e736c)
• Fix webOS 4 & 5 utility methods (#6463) (f3ba2a6)
• Handle non existing navigator.platform string (#6517) (#6518) (3747b8e)
• reBufferingGoal is not respected (#6433) (f6f4771)
• UI: Allow show same resolution with different video bandwidth (#6536) (8ba6503)

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This PR was generated with Release Please. See documentation.

[joeyparrish]

Now that we are releasing from the v4.8 branch, this will be the final release of v4.6.

[shaka-bot]

Incremental code coverage: 100.00%

[joeyparrish]

@shaka-bot please test

[shaka-bot]

@joeyparrish: Lab tests started with arguments:

• pr=6542

[shaka-bot]

🤖 Release is at https://github.com/shaka-project/shaka-player/releases/tag/v4.6.18 🌻