Run sed with -i option in artifacts job

.github/workflows/audit.yml

@@ -25,6 +25,6 @@ jobs:
       run: cargo install cargo-outdated
     - uses: actions/checkout@master
     - name: Delete `web-sys` dependency from `integration` example
-      run: sed '$d' examples/integration/Cargo.toml
+      run: sed -i '$d' examples/integration/Cargo.toml
     - name: Find outdated dependencies
       run: cargo outdated --workspace --exit-code 1