Fix uncaught exception in node JSON-RPC tests

Events don't have an `id`, so promises[response.id] does
not exist for them.

This currently prints a DEP0168 [1] deprecation warning,
but will likely return an error in the future.

[1] https://nodejs.org/api/all.html#all_deprecations_dep0168-unhandled-exception-in-node-api-callbacks

.github/workflows/node-tests.yml

@@ -59,6 +59,7 @@ jobs:
           npm run test
         env:
           DCC_NEW_TMP_EMAIL: ${{ secrets.DCC_NEW_TMP_EMAIL }}
+          NODE_OPTIONS: '--force-node-api-uncaught-exceptions-policy=true'
       - name: Run tests on Windows, except lint
         timeout-minutes: 10
         if: runner.os == 'Windows'
@@ -67,3 +68,4 @@ jobs:
           npm run test:mocha
         env:
           DCC_NEW_TMP_EMAIL: ${{ secrets.DCC_NEW_TMP_EMAIL }}
+          NODE_OPTIONS: '--force-node-api-uncaught-exceptions-policy=true'