ci: fail CI if cargo deny check reports any issue

The echo command was swallowing the exit code of cargo deny.

.github/workflows/deny.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: taiki-e/install-action@cargo-deny
       - name: "Check Licenses / Supply Chain"
         run: |
-          echo "`$(cargo deny --all-features check)`" >> $GITHUB_STEP_SUMMARY
+          cargo deny --all-features check >> $GITHUB_STEP_SUMMARY
       - name: "Build a dependency licenses inventory and post it to Summary"
         run: |
           cargo deny --all-features list --layout crate --format json | jq -r 'to_entries[] | "* \(.key)", "    * \(.value.licenses[])"' >> $GITHUB_STEP_SUMMARY