ci(github): bump node version to v18 and v20

Author: saneef

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        node: ["14", "16", "18"]
+        node: ["18", "20"]
     name: Node.js ${{ matrix.node }} on ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
@@ -20,4 +20,4 @@ jobs:
       - run: npm run lint
       - run: npm test
 env:
-  YARN_GPG: no
+  YARN_GPG: no