- update to 5.1.0:
  * Rebuild against QPDF 10.6.3.
  * Improvements to Makefile for Apple Silicon wheels.
  * Fix issue where Pdf.check() would report a failure if JBIG2 decoder was not
    installed and the PDF contains JBIG2 content.
  * Some errors and inconsistencies are in the "pdfdoc" encoding provided by pikepdf
    have been corrected, in conjunction with fixes in libqpdf.
  * libqpdf 10.6.2 is required.
  * Previously, looking up the number of a page, given the page, required a linear
    search of all pages. We now use a newer QPDF API that allows quicker lookups.
  * Fixed gcc linker error with linking to a source-compiled version of qpdf. Thanks @jerkenbilt.
  * Fixed dead/obsolete link to old QPDF manual. Thanks @m-holger.
  * Rebuild binary wheels against qpdf 10.5.0. Note 10.6.0 has been released but
    requires further changes so does not work yet.
  * Removed some workarounds to support now-unsupported versions of pybind11.
  * Adjusted hypothesis test settings so it does not randomly fail on PyPy.
  * Mention vector vs raster images in documentation.
  * JBIG2 decoding is now more tightly integrated. In particular, we can now decode
    more types of JBIG2 image and they can be decoded using either the object or
    image interface.
  * Switch to tomli for TOML parsing.
  * Refactor image tests to use hypothesis more effectively and use more random issues,
    fixing many errors along the way.
  * Fixed two instances of a Python object being copied without the GIL held.
    May have caused some instability. Thanks @rwgk.
  * Further improvements to handling of 2- and 4-bit per component images. Major
    refactoring of relevant code and improved testing.
  * Mark pybind11 2.9 as supported. Thanks @QuLogic.
  * Improved support for images with bits per component set to values between 2 and 7
    inclusive.

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