Update CI to run on new container

.gitea/workflows/ci.yaml

@@ -10,7 +10,7 @@ env:
 jobs:
   build_and_test:
     name: Rust project - latest
-    runs-on: ubuntu-rustup
+    runs-on: rustup-stable
     strategy:
       matrix:
         toolchain:
@@ -22,5 +22,3 @@ jobs:
       - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
       - run: cargo build --verbose
       - run: cargo test --verbose
-
-