meson: 0.9.1 release

This is only a bugfix release so we keep the 0.9 prefix.
6 jobs for master in 13 minutes and 2 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #6010194
alpine

00:06:30

passed #6005140
arch

00:03:50

passed #6005143
coverity

00:04:33

passed #6005141
debian

00:06:31

passed #6005139
fedora

00:04:33

88.5%
failed #6005142
alpine

00:01:15