add "_gemm_input_role" to dunder slots

[crcrpar]

as I didn't see the strong reason to exclude it from the slots

[pytorch-bot[bot]]

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:white_check_mark: You can merge normally! (4 Unrelated Failures)

As of commit c0a304b952a918ba39528da281fac6b134795d61 with merge base d4b2f334ee4e8b3b1ba75569b80ddba8bdf8fd6a ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Run Regression Tests / test (CUDA 2.2.2, linux.g5.12xlarge.nvidia.gpu, torch==2.2.2 "numpy<2" , cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA 2.3, linux.g5.12xlarge.nvidia.gpu, torch==2.3.0, cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA Nightly (Oct 1), linux.g5.12xlarge.nvidia.gpu, --pre torch==2.6.0.dev20241001+cu121 --... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[msaroufim]

@crcrpar wanna fix the lint so i can merge?

[msaroufim]

I just made the lint