Revert "typing with string literals"

This reverts commit d6a4326.

Author: Vulwsztyn

redis/client.py

@@ -4,7 +4,7 @@
 import time
 import warnings
 from itertools import chain
-from typing import Any, Callable, Dict, List, Optional, Type, Union, Mapping
+from typing import Any, Callable, Dict, List, Optional, Type, Union, Mapping, TYPE_CHECKING
 
 from redis._cache import (
     DEFAULT_ALLOW_LIST,
@@ -51,6 +51,10 @@
     str_if_bytes,
 )
 
+if TYPE_CHECKING:
+    import OpenSSL
+    import ssl
+
 SYM_EMPTY = b""
 EMPTY_RESPONSE = "EMPTY_RESPONSE"
 
@@ -201,9 +205,9 @@ def __init__(
         ssl_password: Optional[str] = None,
         ssl_validate_ocsp: bool = False,
         ssl_validate_ocsp_stapled: bool = False,
-        ssl_ocsp_context: Optional["OpenSSL.SSL.Context"] = None,
+        ssl_ocsp_context: Optional[OpenSSL.SSL.Context] = None,
         ssl_ocsp_expected_cert: Optional[str] = None,
-        ssl_min_version: Optional["ssl.TLSVersion"] = None,
+        ssl_min_version: Optional[ssl.TLSVersion] = None,
         ssl_ciphers: Optional[str] = None,
         max_connections: Optional[int] = None,
         single_connection_client: bool = False,