feat: change default yaml flow style to False #213

Job	Run time
system-testing (debian:unstable-slim)	3m 50s
yamllint	11s
system-testing (ubuntu:jammy)	3m 43s
unittest (debian:bullseye-slim)	31s
system-testing (ubuntu:mantic)	4m 17s
unittest (debian:bookworm-slim)	29s
install (debian:bullseye-slim)	15s
unittest (debian:unstable-slim)	37s
install (debian:bookworm-slim)	13s
unittest (ubuntu:jammy)	37s
install (debian:testing-slim)	17s
unittest (ubuntu:mantic)	31s
install (ubuntu:jammy)	15s
install (ubuntu:mantic)	18s
	16m 4s

Provide feedback