Bump NodeJS to 24 and remove 18 (#151)

Author: soulgalore

.github/workflows/unittests.yml

@@ -11,14 +11,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x, 24.x]
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
-    - name: Install dependencies  
+    - name: Install dependencies
       run: |
         npm ci
     - name: Verify lint