Attempt to fix cibuildwheel installation issue by removing version specification in Travis CI

Co-authored by: nijincheng@iscas.ac.cn;

Author: ffgan

.travis.yml

@@ -36,7 +36,7 @@ jobs:
 
 install:
     # Maybe get and clean and patch source
-    - pip install cibuildwheel==3.2.1 -v
+    - pip install cibuildwheel -v
     - which cibuildwheel
     - cibuildwheel --help # make sure it is installed correctly
     - echo done install step