ci: Work around sanitizer issue on latest Linux kernel

Author: taiki-e

.github/workflows/ci.yml

@@ -266,6 +266,8 @@ jobs:
       - uses: taiki-e/checkout-action@v1
       - name: Install Rust
         run: rustup toolchain install nightly --component rust-src && rustup default nightly
+      # https://github.com/google/sanitizers/issues/1716 / https://github.com/actions/runner-images/issues/9491
+      - run: sudo sysctl vm.mmap_rnd_bits=28
       - run: cargo -Z build-std test --workspace --all-features --target x86_64-unknown-linux-gnu --lib --tests
         env:
           # TODO: Once `cfg(sanitize = "..")` is stable, replace