upgrade paddle version for doc

Author: rogerwwww

docs/requirements.txt

@@ -1,7 +1,7 @@
 torch==1.11.0
 torchvision==0.12.0
 jittor==1.3.4.16
-paddlepaddle==3.1.1
+paddlepaddle==3.0.0
 m2r2
 easydict
 pyyaml