Bump minor version for release 2.2.1

[atalman]

Bump minor version for release 2.2.1

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 0b38670 with merge base 6518fa9 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Unittests on Windows CPU / unittests-windows-cpu / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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