test: bump the timeout for systemd-hwdb-update.service under ASan

Since the hwdb update from a79be2f8
the systemd-hwdb-update service started timing out under ASan when
compiled with gcc, as we started tripping over the 3 minutes timeout.

This affects only gcc runs, since the current gcc on Arch still suffers
from the detect_stack_use_after_return performance penalty[0]. Until
the fixed gcc is present in the respective repositories, let's bump
the timeout to 4 minutes, as we might not be able to upgrade right
away, due to systemd/systemd#16199.

Before the hwdb update:
[ 7958.292540] systemd[63]: systemd-hwdb-update.service: Executing: /usr/bin/time systemd-hwdb update
[ 7958.304005] systemd[1]: systemd-journald.service: Got notification message from PID 44 (FDSTORE=1)
[ 7958.314434] systemd[1]: systemd-journald.service: Added fd 3 (n/a) to fd store.
[ 8008.520082] systemd[1]: systemd-journald.service: Got notification message from PID 44 (WATCHDOG=1)
[ 8068.520151] systemd[1]: systemd-journald.service: Got notification message from PID 44 (WATCHDOG=1)
[ 8125.682843] time[63]: 84.47user 82.92system 2:47.50elapsed 99%CPU (0avgtext+0avgdata 811512maxresident)k
[ 8125.682843] time[63]: 0inputs+19680outputs (0major+25000853minor)pagefaults 0swaps

After the hwdb update:
[ 6215.491958] systemd[63]: systemd-hwdb-update.service: Executing: /usr/bin/time systemd-hwdb update
[ 6215.503380] systemd[1]: systemd-journald.service: Got notification message from PID 44 (FDSTORE=1)
[ 6215.514172] systemd[1]: systemd-journald.service: Added fd 3 (n/a) to fd store.
[ 6329.392918] systemd[1]: systemd-journald.service: Got notification message from PID 44 (WATCHDOG=1)
[ 6394.920205] time[63]: 89.48user 89.98system 2:59.55elapsed 99%CPU (0avgtext+0avgdata 812764maxresident)k
[ 6394.920205] time[63]: 0inputs+20568outputs (0major+27318354minor)pagefaults 0swaps

[0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94910