MAINT: Package updates; solve mypy strict remarks

[MartinThoma]

No description provided.

[codecov]

Codecov Report

Merging #1163 (ddaa913) into main (ec30171) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1163   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files          24       24           
  Lines        4811     4811           
  Branches      991      991           
=======================================
  Hits         4438     4438           
  Misses        231      231           
  Partials      142      142           

Impacted Files	Coverage Δ
PyPDF2/xmp.py	89.16% <ø> (ø)
PyPDF2/_cmap.py	94.23% <100.00%> (ø)
PyPDF2/_encryption.py	85.39% <100.00%> (ø)
PyPDF2/_merger.py	95.00% <100.00%> (ø)
PyPDF2/_page.py	92.55% <100.00%> (ø)
PyPDF2/_reader.py	90.62% <100.00%> (ø)
PyPDF2/_utils.py	98.78% <100.00%> (ø)
PyPDF2/_writer.py	89.00% <100.00%> (ø)
PyPDF2/generic.py	91.57% <100.00%> (ø)
PyPDF2/types.py	100.00% <100.00%> (ø)

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