v0.9.0

• Removed MSC2716 support.
• Added legacy backfill support.
• Updated Docker image to Alpine 3.18.
• Changed all ogg audio messages from WhatsApp to be bridged as voice messages to Matrix, as WhatsApp removes the voice message flag when forwarding for some reason.
• Added Prometheus metric for WhatsApp connection failures (thanks to @Half-Shot in #620).