fix: invocation of pathlib.Path.open (#262)

# Description

Fixes a bug in how `pathlib.Path.open` is invoked.

target_snowflake/connector.py

@@ -141,7 +141,7 @@ def get_private_key(self):
         phrase = self.config.get("private_key_passphrase")
         encoded_passphrase = phrase.encode() if phrase else None
         if "private_key_path" in self.config:
-            with Path.open(self.config["private_key_path"], "rb") as key:
+            with Path(self.config["private_key_path"]).open("rb") as key:
                 key_content = key.read()
         else:
             key_content = self.config["private_key"].encode()