Stick to older jiter for PyPy

Author: xrmx

instrumentation-genai/opentelemetry-instrumentation-openai-v2/tests/requirements.latest.txt

@@ -39,6 +39,8 @@
 openai==1.109.1
 pydantic==2.8.2
 httpx==0.27.2
+# older jiter is required for PyPy < 3.11
+jiter==0.11.1
 Deprecated==1.2.14
 importlib-metadata==6.11.0
 packaging==24.0