main/bluez: need udev-postmount

BlueZ fails to start on boot, after a forced restart
of the service it works. This is avoided by requiring
udev-postmount in the OpenRC init script.
8 jobs for !23489 with bluez-start-on-boot-fix in 12 minutes and 34 seconds (queued for 8 seconds)
detached
Status Job ID Name Coverage
  Lint
passed #444248
docker-alpine x86_64
lint

00:00:52

 
  Build
passed #444253
docker-alpine ci-build aarch64
build-aarch64

00:02:46

passed #444255
docker-alpine ci-build armhf
build-armhf

00:02:30

passed #444254
docker-alpine ci-build armv7
build-armv7

00:02:29

passed #444252
docker-alpine ci-build ppc64le
build-ppc64le

00:08:48

passed #444251
docker-alpine ci-build s390x
build-s390x

00:02:23

passed #444250
docker-alpine ci-build x86
build-x86

00:01:18

passed #444249
docker-alpine ci-build x86_64
build-x86_64

00:00:58