chore(v4.15.x): release 4.15.6

[shaka-bot]

🤖 I have created a release beep boop

4.15.6 (2025-07-07)

Bug Fixes

• ABR: Fix abr switching in some cases (#8836) (6c81c23)
• Bail out on other decodingInfos when we found a preferred and supported one. (#8829) (aea55d3)
• DASH: Always fit segments to period boundaries on VOD (#8825) (63719e6), closes #8774
• DASH: Consider codec profile when matching multi-period renditions (#8842) (9226511)
• Fix disable captions after load using src= on Safari (#8841) (21d773d)
• HLS: Fix disableVideo when the context has muxed audio (#8831) (fd1a35e)
• HLS: Fix playback of content with mixed containers (mp4 and ts) (#8837) (d503e88)
• HLS: Fix preload initial variant (#8835) (c56c350), closes #8830
• LCEVC: Create segmentIndex on makeAbortDecision_ (#8838) (844e7ce)
• MCap improvements in order to support more MCap implementations (#8821) (e8d544e)

Performance Improvements

• Close media source only on audio/video updates (#8826) (f78e6ae)

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This PR was generated with Release Please. See documentation.

[avelad]

@shaka-bot test

[shaka-bot]

@avelad: Lab tests started with arguments:

• pr=8845

[shaka-bot]

Incremental code coverage: 100.00%

[shaka-bot]

🤖 Created releases:

• v4.15.6

🌻