Fix keyvault compatibility with cryptography 47.0.0

- Add __deepcopy__ to KeyVaultRSAPublicKey and KeyVaultRSAPrivateKey
  to satisfy new abstract method added in cryptography 47.0.0
- Pin cryptography<47.0.0 in certificates dev_requirements.txt
  to avoid broken PyPy 3.11 wheel served by CI feed

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: singhalrohit4u

sdk/keyvault/azure-keyvault-certificates/dev_requirements.txt

@@ -6,4 +6,4 @@ aiohttp>=3.0
 parameterized>=0.7.3
 python-dateutil>=2.8.0
 pyopenssl
-cryptography>=44.0.2
+cryptography<47.0.0

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

@@ -317,7 +317,16 @@ def __copy__(self) -> KeyVaultRSAPublicKey:
         """
         return self
 
-    def verifier(  # pylint:disable=docstring-missing-param,docstring-missing-return,docstring-missing-rtype
+    def __deepcopy__(self, memo: dict) -> KeyVaultRSAPublicKey:
+        """Returns this instance since it is treated as immutable.
+
+        :param dict memo: The memo dictionary used by deepcopy.
+        :returns: This instance.
+        :rtype: ~azure.keyvault.keys.crypto.KeyVaultRSAPublicKey
+        """
+        return self
+
+    def verifier(# pylint:disable=docstring-missing-param,docstring-missing-return,docstring-missing-rtype
         self, signature: bytes, padding: AsymmetricPadding, algorithm: HashAlgorithm
     ) -> NoReturn:
         """Not implemented. This method was deprecated in `cryptography` 2.0 and removed in 37.0.0."""
@@ -499,6 +508,15 @@ def __copy__(self) -> KeyVaultRSAPrivateKey:
         """
         return self
 
+    def __deepcopy__(self, memo: dict) -> KeyVaultRSAPrivateKey:
+        """Returns this instance since it is treated as immutable.
+
+        :param dict memo: The memo dictionary used by deepcopy.
+        :returns: This instance.
+        :rtype: ~azure.keyvault.keys.crypto.KeyVaultRSAPrivateKey
+        """
+        return self
+
 
 class DecryptResult:
     """The result of a decrypt operation.