macosx: Fix potential deadlock in VLCExtensionsManager

Ensure mutex is unlocked if extension index exceeds array size to prevent deadlock.

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added 46 commits

• 1ee7a392...29a9f868 - 45 commits from branch videolan:master
• c9c9c284 - macosx: Fix potential deadlock in VLCExtensionsManager

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added 6 commits

• c9c9c284...f45dcaf4 - 5 commits from branch videolan:master
• 8d64f43f - macosx: Fix potential deadlock in VLCExtensionsManager

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enabled an automatic merge when the pipeline for 8d64f43f succeeds

merged