[azure-security-keyvault-keys-cpp] Update to 4.0.0-beta.4 (#19028)

## 4.0.0-beta.4 (2021-07-20)

### Features Added

- Added `GetIv()` to `EncryptParameters` and `DecryptParameters`.
- Added `BackupKeyResult` for `BackupKey()` return type.

### Breaking Changes

- Removed `Azure::Security::KeyVault::Keys::ServiceVersion::V7_0` and `V7_1`.
- Removed `Azure::Security::KeyVault::Keys::Cryptography::ServiceVersion::V7_0` and `V7_1`.
- Removed `CryptographyClient::RemoteClient()` and `CryptographyClient::LocalOnly()`.
- Removed the general constructor from `EncryptParameters` and `DecryptParameters`.
- Removed access to `Iv` field member from `EncryptParameters` and `DecryptParameters`.
- Removed `Encrypt(EncryptionAlgorithm, std::vector, context)`.
- Removed `Decrypt(DecryptAlgorithm, std::vector, context)`.
- Removed `JsonWebKey::HasPrivateKey()`.
- Removed the `MaxPageResults` field from `GetPropertiesOfKeysOptions`, `GetPropertiesOfKeyVersionsOptions`, and `GetDeletedKeysOptions`.
- Renamed header `list_keys_single_page_result.hpp` to `list_keys_responses.hpp`.
- Updated `BackupKey()` API return type to `BackupKeyResult` model type.
- Renamed `KeyPropertiesPageResult` to `KeyPropertiesPagedResponse`.
- Renamed `DeletedKeyPageResult` to `DeletedKeyPagedResponse`.
- Changed the container for `KeyOperations` from `std::list` to `std::vector` within `CreateKeyOptions` and `UpdateKeyProperties()`.
- Changed the return type of `CrytographyClient` APIs like `Encrypt()` to return `Response<T>` rather than the `T` directly.
- Renamed high-level header from `key_vault_keys.hpp` to `keyvault_keys.hpp`.

2 files changed, 6 insertions, 1 deletions

diff --git a/versions/a-/azure-security-keyvault-keys-cpp.json b/versions/a-/azure-security-keyvault-keys-cpp.json
index 6295561f8..b87aed9c0 100644
--- a/versions/a-/azure-security-keyvault-keys-cpp.json
+++ b/versions/a-/azure-security-keyvault-keys-cpp.json
@@ -1,6 +1,11 @@
 {
   "versions": [
     {
+      "git-tree": "beff44522cd72f08bddabfc35a520533b97d1819",
+      "version-semver": "4.0.0-beta.4",
+      "port-version": 0
+    },
+    {
       "git-tree": "cb31e4f4d75f3e38568a324dc412f308bd463bfa",
       "version-semver": "4.0.0-beta.3",
       "port-version": 0
diff --git a/versions/baseline.json b/versions/baseline.json
index 39b7e720d..fd3faebe1 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -289,7 +289,7 @@
       "port-version": 0
     },
     "azure-security-keyvault-keys-cpp": {
-      "baseline": "4.0.0-beta.3",
+      "baseline": "4.0.0-beta.4",
       "port-version": 0
     },
     "azure-storage-blobs-cpp": {