Revert "Revert "Downgrade anyio verison""

This reverts commit db57300.

Author: yinggeh

python/openai/requirements-test.txt

@@ -24,6 +24,10 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+
+# The latest stable version of anyio is 4.12.1 which caused segfault during tests. See TRI-620.
+anyio==4.12.0
+
 # Testing
 pytest==8.1.1
 pytest-asyncio==0.23.8