build(deps): Update cryptography requirement from 42.0.7 to 42.0.8

Updates the requirements on [cryptography](https://github.com/pyca/cryptography) to permit the latest version.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@42.0.7...42.0.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -10,7 +10,7 @@ homepage = "https://github.com/atsign-foundation/at_python"
 
 [tool.poetry.dependencies]
 python = "^3.8.1"
-cryptography = "42.0.7"
+cryptography = "42.0.8"
 python-dateutil = "2.9.0.post0"
 requests = "2.32.3"