chore(v4.3.x): release 4.3.9

[github-actions]

🤖 I have created a release beep boop

4.3.9 (2023-08-21)

Bug Fixes

• add MIME type for HTML5 tracks (#5452) (5fb44db)
• Default language to 'und' for native tracks (#5464) (c31f3db)
• Fix exiting fullscreen on Safari (#5439) (81626b2), closes #5437
• Fix memory leak on SimpleAbrManager (#5478) (f8cb6ef)
• Fix playRangeEnd does not work with HLS streams (#5494) (899eb07)
• gettting maxWidth and maxHeight for restrictToElementSize option (#5481) (053da3b)
• HLS: Fix external subtitles out of sync in HLS (#5491) (38c8a88)
• Remove duplicate adaptation event before init (#5492) (75a55b5)
• Support fLaC and Opus codec strings in HLS (#5454) (09bdd61), closes #5453
• UI: Disable right click on range elements (#5497) (1c55e89)
• Update karma-local-wd-launcher to fix Chromedriver >= 115, fix M1 mac (#5489) (1ce673b)
• Update karma-local-wd-launcher to fix Edge >= 115 (#5506) (4a9bc9b)
• WebVTT: Fix text-shadow in WebVTT not working (#5499) (d78547a)

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[github-actions]

🤖 Release is at https://github.com/shaka-project/shaka-player/releases/tag/v4.3.9 🌻