Bump version from 1.1.0a0 to 1.2.0a0

[mergennachin]

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[pytorch-bot]

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[Copilot]

Pull request overview

This PR bumps the version from 1.1.0a0 to 1.2.0a0, representing a minor version increment in the alpha release series.

Changes:

• Version number updated from 1.1.0a0 to 1.2.0a0 in version.txt

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