fix: updated outdated urls in sample

[r-birkner]

Description

The URLs used in the sample are outdated and do not work anymore. I replaced them with the current URLs. However, I couldn't fix the canister ID as I am not sure what canister it should be.

Fixes # (issue)

How Has This Been Tested?

I updated it and ran it manually. Of course I got an error because the canister doesn't exist anymore, but at least it went through a boundary node and hit a replica.

Checklist:

• [ ] My changes follow the guidelines in CONTRIBUTING.md.
• [ ] The title of this PR complies with Conventional Commits.
• [ ] I have edited the CHANGELOG accordingly.
• [ ] I have made corresponding changes to the documentation.