[CI] Fix paddlepaddle install (#9102)

* [Unified checkpoint] update optimizer async save signal

* update paddlepaddle

---------

Co-authored-by: gongenlei <gongenlei@baidu.com>

Makefile

@@ -46,7 +46,7 @@ unit-test:
 
 .PHONY: install
 install:
-	pip install paddlepaddle==0.0.0 -f https://www.paddlepaddle.org.cn/whl/linux/cpu-mkl/develop.html
+	pip install --pre paddlepaddle -i https://www.paddlepaddle.org.cn/packages/nightly/cpu/
 	pip install -r requirements-dev.txt
 	pip install -r requirements.txt
 	pip install -r paddlenlp/experimental/autonlp/requirements.txt