tests/kola: bump timeout for the upgrade test

We've added a lot of barriers recently and our upgrades are taking
longer. I think part of this is because the performance downloading
from the OSTree repo (for older barriers) is pretty bad.

Either way let's bump this to try to limit some of the timeouts we
are seeing.

Author: dustymabe

tests/kola/upgrade/extended/test.sh

@@ -3,7 +3,7 @@
 ##   # - needs-internet: to pull updates
 ##   tags: "needs-internet"
 ##   # Extend the timeout since a lot of updates/reboots can happen.
-##   timeoutMin: 45
+##   timeoutMin: 75
 ##   # Only run this test when specifically requested.
 ##   requiredTag: extended-upgrade
 ##   description: Verify upgrade works.