Address PR review: revert _models.py change and add cryptography to pyproject.toml

Agent-Logs-Url: https://github.com/Azure/azure-sdk-for-python/sessions/5eb197c9-98b3-4aab-b6ff-e44add5af00e

Co-authored-by: rohitsinghal4u <5697065+rohitsinghal4u@users.noreply.github.com>

Author: Copilot

sdk/keyvault/azure-keyvault-certificates/pyproject.toml

@@ -93,6 +93,7 @@ dev = [
     "azure-identity",
     "azure-keyvault-nspkg",
     "azure-sdk-tools",
+    "cryptography>=44.0.2",
     "parameterized>=0.7.3",
     "pyopenssl",
     "python-dateutil>=2.8.0",

sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py

@@ -252,11 +252,11 @@ def recovery_level(self) -> Optional[str]:
         return self._attributes.recovery_level if self._attributes else None
 
     @property
-    def tags(self) -> Optional[Dict[str, str]]:
+    def tags(self) -> Dict[str, str]:
         """Application specific metadata in the form of key-value pairs.
 
         :returns: A dictionary of tags attached to the key.
-        :rtype: dict[str, str] or None
+        :rtype: dict[str, str]
         """
         return self._tags