tests: Increase timeout of umockdev tests

The new elanspi driver in particular needs a lot of ioctl's during the
test. On a normal machine, this would run quite quickly (less than 5s),
however, in busy CI environments this can take longer than 30s, causing
timeouts currently.

Increase the timeout from 10s to 15s. For CI this means the timeout now
is 45s which is hopefully enough.

tests/meson.build

@@ -98,7 +98,7 @@ if get_option('introspection')
                 args: join_paths(meson.current_source_dir(), driver_test),
                 env: driver_envs,
                 suite: ['drivers'],
-                timeout: 10,
+                timeout: 15,
                 depends: libfprint_typelib,
             )
         else