Change: Drop typing_extensions dependency.

Drop the use of the Self component from typing_extensions and use
the typing library instead

gvm/_enum.py

@@ -4,12 +4,12 @@
 #
 
 from enum import Enum as PythonEnum
-from typing import Any, Optional
-
-from typing_extensions import Self
+from typing import Any, Optional, TypeVar
 
 from gvm.errors import InvalidArgument
 
+Self = TypeVar("Self", bound="PythonEnum")
+
 
 class Enum(PythonEnum):
  """

gvm/protocols/_protocol.py

@@ -3,15 +3,14 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from types import TracebackType
-from typing import Callable, Generic, Optional, Type
-
-from typing_extensions import Self, TypeVar
+from typing import Callable, Generic, Optional, Type, TypeVar
 
 from gvm.connections import GvmConnection
 
 from .core import Connection, Request, Response
 
-T = TypeVar("T", default=str)
+T = TypeVar("T")
+Self = TypeVar("Self", bound="GvmProtocol")
 
 
 def str_transform(response: Response) -> str:

gvm/protocols/core/_response.py

@@ -3,9 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from functools import cached_property
-from typing import Optional
-
-from typing_extensions import Self
+from typing import Optional, TypeVar
 
 from gvm.errors import GvmError
 from gvm.xml import Element, parse_xml
@@ -26,6 +24,9 @@ def __init__(self, message: Optional[str], *args, response: "Response"):
  self.request = response.request
 
 
+Self = TypeVar("Self", bound="Response")
+
+
 class Response:
  """
  A GMP Response

pyproject.toml

@@ -31,7 +31,6 @@ packages = [{ include = "gvm" }, { include = "tests", format = "sdist" }]
 python = "^3.9"
 paramiko = ">=2.7.1"
 lxml = ">=4.5.0"
-typing-extensions = ">=4.9.0"
 
 [tool.poetry.group.dev.dependencies]
 coverage = ">=7.2"