Bug#955045: Update pikepdf to 1.10.3

[Amr Ibrahim]

Package: pikepdf

Please update pikepdf to 1.10.3. It's a bug-fix release.

https://github.com/pikepdf/pikepdf/blob/master/docs/release_notes.rst

v1.10.3

  *   Fixed isinstance(obj, pikepdf.Operator) not working. (#86)

  *   Documentation updates