Update CI/CD to use Node 18 & 19

Author: Sinclert

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
       - name: "Set up Node"
         uses: actions/setup-node@v3
         with:
-          node-version: "15"
+          node-version: "18"
       - name: "Install Prettier"
         run: npm install --global [email protected]
       - name: "Check format"
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [ "15", "16" ]
+        node-version: [ "18", "19" ]
     steps:
       - name: "Set up GitHub Actions"
         uses: actions/checkout@v3