test-resolve: increase timeout to 120s

The test queries some domain names. If the DNS servers are unreachable,
e.g. in a rawhide container I get the total runtime of 24.5s usually, but
sometimes slightly longer, enough to reach the default timeout of 30s.

src/test/meson.build

@@ -929,7 +929,8 @@ tests += [
 
         [['src/libsystemd/sd-resolve/test-resolve.c'],
          [],
-         [threads]],
+         [threads],
+         '', 'timeout=120'],
 
         [['src/libsystemd/sd-login/test-login.c'],
          [],