build: Check whether run_command() succeeded

As per:
WARNING: You should add the boolean check kwarg to the run_command call.
         It currently defaults to false,
         but it will default to true in future releases of meson.
         See also: mesonbuild/meson#9300

meson.build

@@ -1,5 +1,5 @@
 project('umockdev', 'c', 'vala',
-  version: run_command('sed', '-rn', '1 { s/^.*\[([0-9.]+)\].*/\\1/; p }', 'NEWS').stdout().strip(),
+  version: run_command('sed', '-rn', '1 { s/^.*\[([0-9.]+)\].*/\\1/; p }', 'NEWS', check: true).stdout().strip(),
   license: 'LGPLv2.1+')
 
 srcdir = meson.current_source_dir() / 'src'