- Update to version 4.3.1
  Bug Fixes
  astropy.io.fits
  * In fits.io.getdata do not fall back to first non-primary
    extension when user explicitly specifies an extension. [#11860]
  * Ensure multidimensional masked columns round-trip properly to
    FITS. [#11911]
  * Ensure masked times round-trip to FITS, even if
    multi-dimensional. [#11913]
  * Raise ValueError if an np.float32 NaN/Inf value is assigned to
    a header keyword. [#11922]
  astropy.modeling
  * Fixed bug in fix_inputs handling of bounding boxes. [#11908]
  astropy.table
  * Fix an error when converting to pandas any Table subclass that
    automatically adds a table index when the table is created. An
    example is a binned TimeSeries table. [#12018]
  astropy.units
  * Ensure that unpickling quantities and units in new sessions
    does not change hashes and thus cause problems with (de)
    composition such as getting different answers from the .si
    attribute. [#11879]
  * Fixed cannot import name imperial from astropy.units
    namespace. [#11977]
  astropy.utils
  * Ensure any .info on Masked instances is propagated correctly
    when viewing or slicing. As a consequence, MaskedQuantity can
    now be correctly written to, e.g., ECSV format with
    serialize_method='data_mask'. [#11910]

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