fix(deps): update module maunium.net/go/mautrix to v0.12.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
maunium.net/go/mautrix	require	patch	v0.12.3 -> v0.12.4

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Release Notes

mautrix/go

v0.12.4

Compare Source

• Added SendReceipt to support private read receipts and thread receipts in
  the same function. MarkReadWithContent is now deprecated.
• Changed media download methods to return errors if the server returns a
  non-2xx status code.
• Removed legacy sql_store_upgrade.Upgrade method. Using store.DB.Upgrade()
  after NewSQLCryptoStore(...) is recommended instead (the bridge module does
  this automatically).
• Added missing suggested field to m.space.child content struct.
• Added device_unused_fallback_key_types to /sync response and appservice
  transaction structs.
• Changed ReqSetReadMarkers to omit empty fields.
• Changed bridge configs to force sqlite3-fk-wal instead of sqlite3.
• Updated bridge helper to close database connection when stopping.
• Fixed read receipt and account data endpoints sending null instead of an
  empty object as the body when content isn't provided.

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