release.sh: read meson-rewrite output from stdout

Since version 1.6, Meson now uses stdout:
mesonbuild/meson@3f4957c

Author: emersion

release.sh

@@ -1,7 +1,7 @@
 #!/bin/sh -eu
 
 prev=$(git describe --tags --abbrev=0)
-next=$(meson rewrite kwargs info project / 2>&1 >/dev/null | jq -r '.kwargs["project#/"].version')
+next=$(meson rewrite kwargs info project / | jq -r '.kwargs["project#/"].version')
 
 case "$next" in
 *-dev)