[Chapel Merge] Rename a GPU graph file

Branch: refs/heads/main
Revision: 95b7ac9
Author: e-kayrakli
Link: Rename a GPU graph file by e-kayrakli · Pull Request #20353 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #20353 from e-kayrakli/gpu-graph-rename

Rename a GPU graph file

Apparently having .graph files with same name is not allowed. I missed the
warning in my earlier tests. This PR renames the file, and updates
GPU-GRAPHFILES.

[Trivial, not reviewed]

Test: