Update dependency PyPDF2 to <=2.8.0

This MR contains the following updates:

Package	Update	Change
PyPDF2 (source, changelog)	minor	<=2.7.0 -> <=2.8.0

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Release Notes

py-pdf/PyPDF2

v2.8.0

Compare Source

New Features (ENH)

• Add writer.add_annotation, page.annotations, and generic.AnnotationBuilder (#​1120)

Bug Fixes (BUG)

• Set /AS for /Btn form fields in writer (#​1161)
• Ignore if /Perms verify failed (#​1157)

Robustness (ROB)

• Cope with utf16 character for space calculation (#​1155)
• Cope with null params for FitH / FitV destination (#​1152)
• Handle outlines without valid destination (#​1076)

Developer Experience (DEV)

• Introduce _utils.logger_warning (#​1148)

Maintenance (MAINT)

• Break up parse_to_unicode (#​1162)
• Add diagnostic output to exception in read_from_stream (#​1159)
• Reduce PdfReader.read complexity (#​1151)

Testing (TST)

• Add workflow tests found by arc testing (#​1154)
• Decrypt file which is not encrypted (#​1149)
• Test CryptRC4 encryption class; test image extraction filters (#​1147)

Full Changelog: https://github.com/py-pdf/PyPDF2/compare/2.7.0...2.8.0

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