Call Google CDN from info file This describes way to include another version of JQuery file:

scripts[] = [...]
scripts[] = scripts/jquery-132.js
scripts[] = scripts/jquery.foo.js
scripts[] = scripts/jquery-noconflict.js


Then how to include Google JQuery CDN?
I think that this module is what you want to use, jquerycdn.
It allows you to change the default jquery to e.g google cdn.