[Typing] Edit wrongfully set str type annotations

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature] Async collection within trainers #3173
• [Trainers] SAC Trainer and algorithms #3172
• [Feature] Collectors' getattr_policy and getattr_env #3171
• [Feature] track_policy_version in collectors.py #3170
• -> [Typing] Edit wrongfully set str type annotations #3169

[pytorch-bot]

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❌ 2 New Failures, 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 192edd1 with merge base f8bb71b ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t b87766aff8a0fa6f01c3a6a0095558ee228e66fcd92f80cd3fec59777d460d89 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  ##[error]The operation was canceled.
• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh)

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

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

• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh) (trunk failure)
  test/test_libs.py::TestGym::test_gym_fake_td[True-False-3-HalfCheetah-v2]

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