doc: 24.11: release note for syncthing changes

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- `buildNimSbom` was added as an alternative to `buildNimPackage`. `buildNimSbom` uses [SBOMs](https://cyclonedx.org/) to generate packages whereas `buildNimPackage` uses a custom JSON lockfile format.
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- `services.syncthing.folders.<name>.devices` now accepts an `attrset`, allowing to set `encryptionPassword` file for a device.
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## Detailed Migration Information {#sec-release-24.11-migration}
### `sound` options removal {#sec-release-24.11-migration-sound}