[inductor] Use a large tolerance for botnet26t_256 (#90383)
Summary: botnet26t_256 shows random tolerance failure on CI. The root
cause of this randomness is still to-be-invesitgated, but let's use a
larger tolerance for now.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90383
Approved by: https://github.com/ezyang
