Add one more shard for CPU jobs

[huydhn]

The first shard is very close to 3.5h and timeout sometimes now https://hud.pytorch.org/pytorch/pytorch/commit/1c75ddff3576a0bd7ed664476c49020c35875ab5#26540310592

[pytorch-bot]

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[huydhn]

@pytorchbot merge -f 'Lint has passed, no need to run trunk jobs with this CI-only tweak'

[pytorchmergebot]

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