Revert "Pin pt nightly CPU version"

[HDCharles]

Reverts pytorch/ao#1061

seems this caused an issue

relevant to: https://github.com/pytorch/ao/issues/1063 https://github.com/pytorch/ao/issues/1062

hopefully https://github.com/pytorch/ao/pull/1061 does not resurface and it was an env issue

[pytorch-bot[bot]]

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[gau-nernst]

It seems like related to this https://stackoverflow.com/questions/49875588/importerror-lib64-libstdc-so-6-version-cxxabi-1-3-9-not-found

So something along the lines of a compiler (from conda) was used to compile the codegen CPU code but a different C++ stdlib (from system) was used to run the compiled code? Kinda strange that it didn't surface for CUDA nightly job.

Edit: though the tests pass now, I think it's still worth to investigate why this is happening on CPU nightly though.

[msaroufim]

SUCCESS!