Bump github.com/go-jose/go-jose/v3 from 3.0.1 to 3.0.3 in /examples/proof-of-concept/mosquitto/things/mosquitto-demo

Bump github.com/go-jose/go-jose/v3 from 3.0.1 to 3.0.3 in /examples/proof-of-concept/mosquitto/things/mosquitto-demo #399