Change benchmark timeout to 120 minutes

[jack-berg]

Followup to #8308. Benchmark hasn't been running successfully since making that change because it never finishes in time. I don't think we need 120 minutes, but I don't know how much we'll need. Can tune it back down after finding out.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.82%. Comparing base (b87fa99) to head (3c57175).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8358   +/-   ##
=========================================
  Coverage     90.82%   90.82%           
  Complexity     7927     7927           
=========================================
  Files           895      895           
  Lines         23872    23872           
  Branches       2378     2378           
=========================================
  Hits          21681    21681           
  Misses         1446     1446           
  Partials        745      745           

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