Add flake8-implicit-str-concat rules to Ruff (#33191)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/entrypoints/openai/tool_parsers/test_llama4_pythonic_tool_parser.py

@@ -193,7 +193,7 @@ TEST_CASES = [
     pytest.param(
         False,
         "<|python_start|>[get_weather(city='LA', metric='C'), "
-        + "register_user(name='Doe', age=9)]",
+        "register_user(name='Doe', age=9)]",
         [
             SIMPLE_FUNCTION_CALL,
             FunctionCall(name="register_user", arguments='{"name": "Doe", "age": 9}'),

tests/tool_parsers/test_deepseekv31_tool_parser.py

@@ -24,9 +24,9 @@ def parser(deepseekv31_tokenizer):
 def test_extract_tool_calls_with_tool(parser):
     model_output = (
         "normal text"
-        + "<｜tool▁calls▁begin｜>"
-        + '<｜tool▁call▁begin｜>foo<｜tool▁sep｜>{"x":1}<｜tool▁call▁end｜>'
-        + "<｜tool▁calls▁end｜>"
+        "<｜tool▁calls▁begin｜>"
+        '<｜tool▁call▁begin｜>foo<｜tool▁sep｜>{"x":1}<｜tool▁call▁end｜>'
+        "<｜tool▁calls▁end｜>"
     )
     result = parser.extract_tool_calls(model_output, None)
     assert result.tools_called
@@ -39,11 +39,11 @@ def test_extract_tool_calls_with_tool(parser):
 def test_extract_tool_calls_with_multiple_tools(parser):
     model_output = (
         "some prefix text"
-        + "<｜tool▁calls▁begin｜>"
-        + '<｜tool▁call▁begin｜>foo<｜tool▁sep｜>{"x":1}<｜tool▁call▁end｜>'
-        + '<｜tool▁call▁begin｜>bar<｜tool▁sep｜>{"y":2}<｜tool▁call▁end｜>'
-        + "<｜tool▁calls▁end｜>"
-        + " some suffix text"
+        "<｜tool▁calls▁begin｜>"
+        '<｜tool▁call▁begin｜>foo<｜tool▁sep｜>{"x":1}<｜tool▁call▁end｜>'
+        '<｜tool▁call▁begin｜>bar<｜tool▁sep｜>{"y":2}<｜tool▁call▁end｜>'
+        "<｜tool▁calls▁end｜>"
+        " some suffix text"
     )
 
     result = parser.extract_tool_calls(model_output, None)

tests/utils.py

@@ -1302,7 +1302,7 @@ def prep_prompts(batch_size: int, ln_range: tuple[int, int] = (800, 1100)):
         indices.append(idx)
         prompt = (
             "```python\n# We set a number of variables, "
-            + f"x{idx} will be important later\n"
+            f"x{idx} will be important later\n"
         )
         ln = random.randint(*ln_range)
         for k in range(30, ln):