Enable stable CI again

Now that Rust 1.85 has been released.

Author: Thomasdezeeuw

.github/workflows/ci.yaml

@@ -15,7 +15,6 @@ jobs:
   Test:
     runs-on: ubuntu-24.04
     timeout-minutes: 5
-    if: false # Enable once Rust 1.85 is released.
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@1.85