Use python3 in .lintrunner.toml

[shoumikhin]

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[pytorch-bot]

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❌ 2 New Failures, 3 Pending, 1 Unrelated Failure

As of commit 3320d07 with merge base ce57d79 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cadence/hifi/operators/op_mm.cpp:
• pull / unittest-arm / linux-job (gh)
  RuntimeError: Command docker exec -t 680e79f4d51d97495f60aa1633ea28fba908e28d8bdeafe9f5b51ac67be1555b /exec failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 255

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[GregoryComer]

@shoumikhin FYI This breaks conda setup in a few places. Is it possible to conditionally use the correct python?

[shoumikhin]

@GregoryComer how to repro? Fwiw, I don't use conda. This change is to make linter work on a Mac.