Update SIN-4-1-20

[AlexisPolegato]

Update SIN-4-1-20 FW 1 to V2.31.0
Add SIN-4-1-20 FW 2 V1.1.1

[Koenkk]

Please use the add script when adding OTA files, this makes sure they get added to the index.json.

[Koenkk]

I see the firmwares are for the same device, why did you upload both firmwares? (only 1 of them will be used)

[AlexisPolegato]

The device has 2 different firmwares ; both can be updated.

[Koenkk]

I see, just noticed that the imageType is different, thanks!