chore: upgrade to markdownlint v0.39.0 (#3200) #6845

Job	Run time
docker-security-build / prepare-env	4s
docker-txsim-build / prepare-env	3s
docker-security-build / logic-check	1s
docker-txsim-build / logic-check	1s
docker-security-build / docker-security	1m 56s
docker-txsim-build / docker-security	1m 59s
docker-security-build / docker-build (DockerHub; docker.io/celestiaorg/celestia-app)	2m 10s
docker-security-build / docker-build (GHCR; ghcr.io/celestiaorg/celestia-app)	2m 24s
docker-security-build / docker-build (ScaleWay; rg.fr-par.scw.cloud/celestiaorg/celestia-app)	2m 34s
docker-txsim-build / docker-build (DockerHub; docker.io/celestiaorg/txsim)	3m 50s
docker-txsim-build / docker-build (GHCR; ghcr.io/celestiaorg/txsim)	3m 52s
docker-txsim-build / docker-build (ScaleWay; rg.fr-par.scw.cloud/celestiaorg/txsim)	4m 7s
	23m 1s

Provide feedback