Cannot edit "OtaChecksumType" from Model-Version

[jcps07]

The update-model-version command doesn't allow to update the "OtaChechsumType" field.
Other OTA fields such as otaChecksum, otaFileSize, and otaURL are eligible for update.

This means that user would still most likely require deleting and adding back the entry instead of updating if something related to OTA is required to be updated.

[ashcherbakov]

@jcps07
According to https://github.com/CHIP-Specifications/connectedhomeip-spec/blob/master/src/service_device_management/DistributedComplianceLedger.adoc#ref_DeviceModelSchema, only OtaUrl is mutable.
It seems we need to clarify an expected behavior and update code and/or Spec after this...