Added optional encryption dependency

pyproject.toml

@@ -7,6 +7,9 @@ requires-python = ">=3.10"
 authors = [{ name = "Florian Gänsejunge" }]
 dependencies = ["simple-logger-handler @ git+https://git.gansejunge.com/notifier/lib-logger-handler.git@main"]
 
+[project.optional-dependencies]
+encryption = ["cryptography==46.0.2"]
+
 [build-system]
 requires = ["setuptools>=61"]
 build-backend = "setuptools.build_meta"