Maybe there's something specific about templates/blueprints that lets you automatically update those, but I don't use them and can't help you with those.
But if there isn't, you can use the Canvas APIs to loop through each course and then edit the pages. Since the pages in each course should be the same, with a bit of coding it shouldn't be hard to go straight to the specific page by their name and then edit the URL.
Here's the information page for the Courses API, to load each of the courses: Courses | Instructure Developer Documentation Portal
Here's the information page for the Pages API, to find the required pages and then edit them: Pages | Instructure Developer Documentation Portal
If the link is not on a page, but in a quiz, announcement, or something else, it still should be possible with the appropriate API that you can find in the side menus of the links above.