Increase meson test timeout

Running the testsuite using "PACTEST_VALGRIND=1 ninja test -C build", I ran
into the following failure:

161/332 smoke001.py                             TIMEOUT 30.02 s

I figure an i7 @ 3.10GHz should be enough to run our testsuite... so boost
the meson test timeout to 120 seconds (which should be enough time for
anyone...).
Signed-off-by: Allan McRae <allan@archlinux.org>

test/pacman/meson.build

@@ -352,5 +352,6 @@ foreach input : pacman_tests
     PYTHON,
     protocol : 'tap',
     args : args,
+    timeout: 120,
     depends : [pacman_bin])
 endforeach