* Bump cryptography from 44.0.2 to 46.0.5 in /requirements

Bumps [cryptography](https://github.com/pyca/cryptography) from 44.0.2 to 46.0.5.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@44.0.2...46.0.5)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-version: 46.0.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update cffi version to 2.0.0

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stefan <96178532+stefan6419846@users.noreply.github.com>

…ig (#3634)

Closes #3633.

---------

Co-authored-by: John Sharp <john.sharp@accessia.com>
Co-authored-by: Stefan <96178532+stefan6419846@users.noreply.github.com>

…ts` (#3638)

Closes #3632.

…3641)

Previously, calculating `bpp` could raise a ZeroDivisionError due to
invalid column values. The validation has been extended in accordance to
the PDF specification which requires these values to always be positive.

Some additionally refactoring has been included to simplify the existing
code and drop the exception handling where possible when retrieving the
parameters.

## What's new

### Security (SEC)
- Detect cyclic references when accessing TreeObject.children (#3645) by @stefan6419846
- Limit size of `/ToUnicode` entries (#3646) by @stefan6419846
- Limit FlateDecode recovery attempts (#3644) by @stefan6419846

### Bug Fixes (BUG)
- Avoid own object replacement logic in `PageObject.replace_contents` (#3638) by @stefan6419846
- Fix UnboundLocalError when update_page_form_field_values with /Sig (#3634) by @John-Sharp

### Robustness (ROB)
- Avoid divison by zero when decoding FlateDecode PNG prediction (#3641) by @stefan6419846

[Full Changelog](6.7.0...6.7.1)