Bump pypdf from 6.4.0 to 6.9.1 (#2281)

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 6.4.0 to 6.9.1.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](https://github.com/py-pdf/pypdf/compare/6.4.0...6.9.1)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.9.1
  dependency-type: indirect
...

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poetry.lock

@@ -2510,14 +2510,14 @@ diagrams = ["jinja2", "railroad-diagrams"]
 
 [[package]]
 name = "pypdf"
-version = "6.4.0"
+version = "6.9.1"
 description = "A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files"
 optional = false
 python-versions = ">=3.9"
 groups = ["main"]
 files = [
-    {file = "pypdf-6.4.0-py3-none-any.whl", hash = "sha256:55ab9837ed97fd7fcc5c131d52fcc2223bc5c6b8a1488bbf7c0e27f1f0023a79"},
-    {file = "pypdf-6.4.0.tar.gz", hash = "sha256:4769d471f8ddc3341193ecc5d6560fa44cf8cd0abfabf21af4e195cc0c224072"},
+    {file = "pypdf-6.9.1-py3-none-any.whl", hash = "sha256:f35a6a022348fae47e092a908339a8f3dc993510c026bb39a96718fc7185e89f"},
+    {file = "pypdf-6.9.1.tar.gz", hash = "sha256:ae052407d33d34de0c86c5c729be6d51010bf36e03035a8f23ab449bca52377d"},
 ]
 
 [package.dependencies]
@@ -2526,7 +2526,7 @@ typing_extensions = {version = ">=4.0", markers = "python_version < \"3.11\""}
 [package.extras]
 crypto = ["cryptography"]
 cryptodome = ["PyCryptodome"]
-dev = ["black", "flit", "pip-tools", "pre-commit", "pytest-cov", "pytest-socket", "pytest-timeout", "pytest-xdist", "wheel"]
+dev = ["flit", "pip-tools", "pre-commit", "pytest-cov", "pytest-socket", "pytest-timeout", "pytest-xdist", "wheel"]
 docs = ["myst_parser", "sphinx", "sphinx_rtd_theme"]
 full = ["Pillow (>=8.0.0)", "cryptography"]
 image = ["Pillow (>=8.0.0)"]