Bump version to 0.3.3

[percevalw]

Description

• Handle empty inputs (e.g. as_folded_tensor([[[], []], [[]]])) by returning an empty tensor
• Correctly bubble errors when converting inputs with varying deepness (e.g. as_folded_tensor([1, [2, 3]]))

Checklist

• If this PR is a bug fix, the bug is documented in the test suite.
• Changes were documented in the changelog (pending section).
• If necessary, changes were made to the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d154ec6) 100.00% compared to head (634f933) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines          145       145           
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  Hits           145       145           

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