Bump cryptography from 49.0.0 to 50.0.0 in /doc

Bumps [cryptography](https://github.com/pyca/cryptography) from 49.0.0 to 50.0.0.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@49.0.0...50.0.0)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-version: 50.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

doc/requirements.txt

@@ -11,7 +11,7 @@ certifi==2026.6.17
 cffi==2.0.0; platform_python_implementation != "PyPy"
 charset-normalizer==3.4.7
 colorama==0.4.6; sys_platform == "win32"
-cryptography==49.0.0
+cryptography==50.0.0
 decorator==5.3.1
 docutils==0.22.4; python_version >= "3.11"
 docutils==0.21.2; python_version >= "3.10" and python_version < "3.11"