⚠️ SECURITY: Patch 12 Dependabot security vulnerabilities

- Update poetry.lock: GitPython 3.1.49, cryptography 46.0.7,
  filelock 3.29.0, urllib3 2.6.3, requests 2.33.1
- Add `from __future__ import annotations` to workflow.py and task.py
  to fix Python 3.9 compatibility (PEP 604 union syntax)

Resolves: Dependabot alerts #6, #7, #8, #9, #11, #13, #15, #16, #17, #18, #20, #21

Author: FernandoCelmer

dotflow/core/serializers/workflow.py

@@ -1,7 +1,8 @@
 """Workflow serializer module"""
 
-# mypy: disable-error-code="misc"
+from __future__ import annotations
 
+# mypy: disable-error-code="misc"
 from uuid import UUID
 
 from pydantic import BaseModel, ConfigDict, Field, computed_field

dotflow/core/task.py

@@ -1,5 +1,7 @@
 """Task module"""
 
+from __future__ import annotations
+
 import json
 from collections.abc import Callable
 from datetime import datetime
@@ -25,6 +27,8 @@
 
 class TaskInstance:
     """
+from __future__ import annotations
+
     Import:
         You can import the **TaskInstance** class with:
 
@@ -323,7 +327,7 @@ def add(
         callback: Callable = basic_callback,
         initial_context: Any = None,
         group_name: str = "default",
-    ) -> "TaskBuilder":
+    ) -> TaskBuilder:
         """
         Args:
             step (Callable):