Fix autoquant after version util changes (pytorch#2858)

Summary:
version semantics is fixed in pytorch#2786 and we are updating the
version check logic accordingly

Test Plan:
python test/integration/test_integration.py -k test_autoquant_hp_float

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Tasks:

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Author: jerryzh168

torchao/quantization/autoquant.py

@@ -344,8 +344,7 @@ def do_autoquant_bench(op, *args, **kwargs):
         graph = torch.cuda.CUDAGraph()
         with torch.cuda.graph(graph, stream=stream):
             op(*args, **kwargs)
-        # TODO: update to 2.8.0 after https://github.com/pytorch/ao/pull/2786 is landed
-        if torch_version_at_least("2.9.0"):
+        if torch_version_at_least("2.8.0"):
             from statistics import median
 
             res = benchmarker.benchmark_gpu(