ci: Temporary CI workaround

See rust-lang/rustup#3709

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust
-        run: rustup install --profile minimal stable && rustup default stable
+        run: rustup install --no-self-update --profile minimal stable && rustup default stable
       - name: Cache builds
         uses: Swatinem/rust-cache@v2.7.3
       - name: Compile