Update dependency PyPDF2 to <=2.7.0

This MR contains the following updates:

Package	Update	Change
PyPDF2 (source, changelog)	minor	<=2.6.0 -> <=2.7.0

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Release Notes

py-pdf/PyPDF2

v2.7.0

Compare Source

New Features (ENH)

• Add outline_count property (#​1129)

Bug Fixes (BUG)

• Make reader.get_fields also return dropdowns with options (#​1114)
• Add deprecated EncodedStreamObject functions back until PyPDF2==3.0.0 (#​1139)

Robustness (ROB)

• Cope with missing /W entry (#​1136)
• Cope with invalid parent xref (#​1133)

Documentation (DOC)

• Contributors file (#​1132)
• Fix type in signature of PdfWriter.add_uri (#​1131)

Developer Experience (DEV)

• Add .git-blame-ignore-revs (#​1141)

Code Style (STY)

• Fixing typos (#​1137)
• Re-use code via get_outlines_property in tests (#​1130)

Full Changelog: https://github.com/py-pdf/PyPDF2/compare/2.6.0...2.7.0

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