v0.12.1

Release post: https://mau.fi/blog/2025-05-mautrix-release/

• Added prefix to identify forwarded messages on WhatsApp.
• Updated mime type of unconverted animated stickers to video/lottie+json which is now registered with IANA.
• Changed relogin command to not require entering phone number twice when using phone code login.
• Fixed outgoing messages being rejected if they replied to a fake message generated by the bridge.
• Fixed backfilling messages in existing portals after relogining.