raise the watchdog for sysupgrade-initiated updates from 30m to 45m.

on my anoncvs server it takes about 20m already to untar sets, which is
a bit close to the limit for my liking (we only want to trigger the
watchdog if things are *really* stuck; if it's still proceeding then
rebooting mid-upgrade can leave things in a worse state).

we can probably do something smarter (e.g. reset the watchdog after
untarring each set) but this is an easier-to-test initial improvement.

ok florian deraadt kn

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