Update dependency PyPDF2 to <=2.9.0

This MR contains the following updates:

Package	Update	Change
PyPDF2 (source, changelog)	minor	<=2.8.1 -> <=2.9.0

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Release Notes

py-pdf/PyPDF2

v2.9.0

Compare Source

New Features (ENH)

• Add ability to add hex encoded colors to outline items (#​1186)
• Add support for pathlib.Path in PdfMerger.merge (#​1190)
• Add link annotation (#​1189)
• Add capability to filter text extraction by orientation (#​1175)

Bug Fixes (BUG)

• Named Dest in PDF1.1 (#​1174)
• Incomplete Graphic State save/restore (#​1172)

Documentation (DOC)

• Update changelog url in package metadata (#​1180)
• Mantion camelot for table extraction (#​1179)
• Mention pyHanko for signing PDF documents (#​1178)
• Weow have CMAP support since a while (#​1177)

Maintenance (MAINT)

• Consistant usage of warnings / log messages (#​1164)
• Consistent terminology for outline items (#​1156)

Full Changelog: https://github.com/py-pdf/PyPDF2/compare/2.8.1...2.9.0

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