Bump docker/bake-action from 5 to 6 #695

Job	Run time
prepare (mainline)	25s
prepare (buildkit)	8s
prepare (desktop)	34s
validate (./hack/lint)	30s
e2e (mainline, pip-youtube-dl, linux/arm/v7)	1m 21s
validate (./hack/validate-vendor)	17s
test (mainline)	4m 9s
validate (./hack/install-and-test)	44s
e2e (mainline, webpack, linux/arm/v7)	2m 9s
test (buildkit)	32s
e2e (desktop, pip-youtube-dl, linux/arm/v7)	1m 47s
test (desktop)	7s
e2e (desktop, webpack, linux/arm/v7)	1m 56s
e2e (mainline, ejabberd, linux/arm64)	13m 58s
e2e (desktop, tini, linux/arm64, --rm)	42s
e2e (desktop, postgis, linux/arm64, -d --name postgis, postgis, UTC [1] LOG: database system is ...	48s
build	0s
	30m 7s

Provide feedback