CI: bump meson version from 0.59 to 0.60.3
We pull in glib main via a subproject in CI and glib has recently bumped its meson requirement to >= 0.60: glib!2641 (merged)
Install 0.60.3 where needed to make things build again.
We pull in glib main via a subproject in CI and glib has recently bumped its meson requirement to >= 0.60: glib!2641 (merged)
Install 0.60.3 where needed to make things build again.