Add iOS 18 support

[n0vad3v]

iOS 18 still sends text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 as accept header, so we need to manually add support for iOS18.

[github-actions]

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ghcr.io/webp-sh/webp_server_go (debian 12.7)
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Total: 0 (HIGH: 0, CRITICAL: 0)