Require GPyTorch>=1.15.1.

[saitcakmak]

---

[meta-codesync]

@saitcakmak has imported this pull request. If you are a Meta employee, you can view this in D93482264.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.99%. Comparing base (58f0104) to head (8d36856).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3184   +/-   ##
=======================================
  Coverage   99.99%   99.99%           
=======================================
  Files         219      219           
  Lines       21412    21412           
=======================================
  Hits        21411    21411           
  Misses          1        1           

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[meta-codesync]

@saitcakmak merged this pull request in d381975.