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25dadb19 - [ty] Sync vendored typeshed stubs, support `builtins.sentinel` (#26341)

[ty] Sync vendored typeshed stubs, support `builtins.sentinel` (#26341) Close and reopen this PR to trigger CI Closes #26262, closes https://github.com/astral-sh/ty/issues/3752 --------- Co-authored-by: typeshedbot <> Co-authored-by: Alex Waygood <alex.waygood@gmail.com>