Revert "try cleaning miri cache"

This reverts commit 6f80b5e.

.github/workflows/ci.yml

@@ -199,8 +199,6 @@ jobs:
           components: miri
           override: true
       - uses: Swatinem/rust-cache@v1
-      - name: tmp clean
-        run: cargo clean
       - name: miri
         # Many of tests in tokio/tests and doctests use #[tokio::test] or
         # #[tokio::main] that calls epoll_create1 that Miri does not support.