fix notice build

Author: lucarin91

.licenses/arduino-app-cli/go/google.golang.org/protobuf/proto.dep.yml

@@ -59,5 +59,4 @@ licenses:
     infringement, or inducement of patent infringement, then any patent
     rights granted to you under this License for this implementation of Go
     shall terminate as of the date such litigation is filed.
-- sources:
 notices: []