chore(main): release lib/flattening 0.1.3 #6910

Job	Run time
benchmark tests	4m 23s
Protocol Buffer Lint and Gencode Up-to-date check	18s
go (examples)	57s
image build	1m 44s
go (sdk)	1m 57s
go (service)	3m 11s
go (lib/ocrypto)	37s
integration tests	4m 28s
go (lib/fixtures)	37s
go (lib/flattening)	50s
license check	50s
otdfctl e2e tests	5m 3s
platform-xtest / cross-client-test	8m 47s
ci	1s
	33m 43s

Provide feedback