bump min-scale timeout

[dprotaso]

In CI we're seeing only one pod spin up. Increasing
the timeout to see if this gives other pods time to
also spin up

Fixes: #16240

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[dprotaso]

/assign @dsimansk @linkvt

[linkvt]

/lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.06%. Comparing base (6b8cc01) to head (cde9475).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16244      +/-   ##
==========================================
- Coverage   80.07%   80.06%   -0.02%     
==========================================
  Files         215      215              
  Lines       13327    13327              
==========================================
- Hits        10672    10670       -2     
- Misses       2295     2297       +2     
  Partials      360      360              

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