triage-policies: Change updated_at to created_at for unlabeled issues

So even if the bot does something, or there is some movement that are
not labels, the issue is still taken care of for proper triaging.

Increased also to two months to compensate for the change.
9 jobs for master in 22 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Triage
passed #168360
triage

00:02:02

manual #168361
allowed to fail manual
triage:dry-run
 
  Test
passed #168362
flatpak devel

00:11:22

9.0%
 
  Cross Environment
passed #168363
fedora rawhide

00:07:02

failed #168367
flatpak gtk4

00:08:39

failed #168366
flatpak master

00:07:14

passed #168365
opensuse tumbleweed

00:07:20

passed #168364
ubuntu devel

00:03:56

 
  Deploy
skipped #168368
pages
 
Name Stage Failure
failed
flatpak gtk4 Cross Environment
Received signal:15->'Terminated'
OK

Uploading artifacts...
nautilus-dev.flatpak: found 1 matching files
_build/meson-logs/meson-log.txt: found 1 matching files
_build/meson-logs/testlog.txt: found 1 matching files
Uploading artifacts to coordinator... ok id=168367 responseStatus=201 Created token=hbRKkwsy
ERROR: Job failed: exit code 1
failed
flatpak master Cross Environment
Received signal:15->'Terminated'
OK

Uploading artifacts...
nautilus-dev.flatpak: found 1 matching files
_build/meson-logs/meson-log.txt: found 1 matching files
_build/meson-logs/testlog.txt: found 1 matching files
Uploading artifacts to coordinator... ok id=168366 responseStatus=201 Created token=5y-DRraX
ERROR: Job failed: exit code 1