Update .github/workflows/rust-toolchain-upgrade.yml

Co-authored-by: Ryan <[email protected]>

Author: LegNeato

.github/workflows/rust-toolchain-upgrade.yml

@@ -74,4 +74,4 @@ jobs:
             - Project builds successfully
             - Tests pass
             
-            This PR was automatically generated by the Rust toolchain upgrade workflow.
+            This PR was automatically generated by the [Rust toolchain upgrade workflow](https://github.com/Rust-GPU/rust-gpu/blob/main/.github/workflows/rust-toolchain-upgrade.yml).