BUG: Add PdfObject.getObject back

[MartinThoma]

No description provided.

[codecov]

Codecov Report

Merging #911 (77c62ad) into main (892299c) will decrease coverage by 0.03%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #911      +/-   ##
==========================================
- Coverage   77.92%   77.89%   -0.04%     
==========================================
  Files          16       16              
  Lines        4321     4324       +3     
  Branches      813      813              
==========================================
+ Hits         3367     3368       +1     
- Misses        782      784       +2     
  Partials      172      172              

Impacted Files	Coverage Δ
PyPDF2/generic.py	77.77% <33.33%> (-0.13%)	⬇️

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