run rustup default stable

.github/workflows/verify.yml

@@ -27,14 +27,7 @@ jobs:
     container: sfja/h5-mst-ci:1.3
     steps:
     - uses: actions/checkout@v6
-    - name: cache crates
-      uses: actions/cache@v4
-      with:
-        path: |
-          ~/.cargo/registry
-          ~/.cargo/git
-          target
-        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+    - run: rustup default stable
     - name: check
       working-directory: ./unnamed-game-engine
       run: cargo check