Fix lint errors: remove unused variable and add raw string prefixes

- Remove unused 'crew' variable in test_hierarchical_crew_does_not_propagate_agent_tools_to_manager (F841)
- Add raw string prefixes to regex patterns to comply with RUF043 linting rule
- Pre-existing RUF043 errors in changed files were blocking PR, so fixed them

Co-Authored-By: João <joao@crewai.com>

tests/test_crew.py

@@ -200,7 +200,7 @@ def test_async_task_cannot_include_sequential_async_tasks_in_context(
     # This should raise an error because task2 is async and has task1 in its context without a sync task in between
     with pytest.raises(
         ValueError,
-        match="Task 'Task 2' is asynchronous and cannot include other sequential asynchronous tasks in its context.",
+        match=r"Task 'Task 2' is asynchronous and cannot include other sequential asynchronous tasks in its context.",
     ):
         Crew(tasks=[task1, task2, task3, task4, task5], agents=[researcher, writer])
 
@@ -238,7 +238,7 @@ def test_context_no_future_tasks(researcher, writer):
     # This should raise an error because task1 has a context dependency on a future task (task4)
     with pytest.raises(
         ValueError,
-        match="Task 'Task 1' has a context dependency on a future task 'Task 4', which is not allowed.",
+        match=r"Task 'Task 1' has a context dependency on a future task 'Task 4', which is not allowed.",
     ):
         Crew(tasks=[task1, task2, task3, task4], agents=[researcher, writer])
 
@@ -3339,7 +3339,7 @@ def test_replay_with_invalid_task_id():
     ):
         with pytest.raises(
             ValueError,
-            match="Task with id bf5b09c9-69bd-4eb8-be12-f9e5bae31c2d not found in the crew's tasks.",
+            match=r"Task with id bf5b09c9-69bd-4eb8-be12-f9e5bae31c2d not found in the crew's tasks.",
         ):
             crew.replay("bf5b09c9-69bd-4eb8-be12-f9e5bae31c2d")
 
@@ -3842,7 +3842,7 @@ def test_hierarchical_crew_does_not_propagate_agent_tools_to_manager():
         agent=agent_with_tools,
     )
 
-    crew = Crew(
+    Crew(
         agents=[agent_with_tools],
         tasks=[task],
         process=Process.hierarchical,

tests/test_task.py

@@ -1222,7 +1222,7 @@ def test_create_directory_false():
     assert not resolved_dir.exists()
 
     with pytest.raises(
-        RuntimeError, match="Directory .* does not exist and create_directory is False"
+        RuntimeError, match=r"Directory .* does not exist and create_directory is False"
     ):
         task._save_file("test content")