ci: Add support for Node.js 18 (#5793)

* ci: Start supporting Node.js 18

Node.js 18 became the active LTS on 2022-10-25, and Node.js 16 went into maintenance mode.
https://github.com/nodejs/Release#release-schedule

We should also slowly deprecate node 16 support, [as support for it is ends much earlier now, due to support for openssl 1.1.1 ending](https://nodejs.org/en/blog/announcements/nodejs16-eol).

* Remove hashing algorithms that are not available in newer node.js/openssl

- RSA-MD4
- RSA-MDC2
- md4
- md4WithRSAEncryption
- mdc2
- mdc2WithRSA

* in e2e tests, resolve `localhost` to ipv4 instead of ipv6

.github/workflows/test-workflows.yml

@@ -11,9 +11,6 @@ jobs:
 
     timeout-minutes: 30
 
-    strategy:
-      matrix:
-        node-version: [16.x]
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -30,10 +27,9 @@ jobs:
         with:
           version: 8.1.0
 
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
+      - uses: actions/setup-node@v3
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: 18.x
           cache: 'pnpm'
           cache-dependency-path: 'n8n/pnpm-lock.yaml'