test: increase timeout for test-path

The CI occasionally fail in test-path with a timeout. test-path loads
units from the filesystem, and this conceivably might take more than
the default limit of 3 s. Increase the timeout substantially to see if
this helps.

src/test/meson.build

@@ -671,7 +671,8 @@ tests += [
           libseccomp,
           libselinux,
           libmount,
-          libblkid]],
+          libblkid],
+         '', 'timeout=120'],
 
         [['src/test/test-execute.c'],
          [libcore,