Run CI on Node 18.

Author: Tpt

.github/workflows/ci.yml

@@ -11,8 +11,8 @@ jobs:
           - 10.x
           - 12.x
           - 14.x
-          - 15.x
           - 16.x
+          - 18.x
     steps:
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2