chore(workflow::tests): replace nodejs version 17 with 18

Author: hasezoey

.github/workflows/tests.yml

@@ -17,8 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # TODO: replace "17.x" with "18.x" when 18 releases
-        node-version: [12.x, 14.x, 16.x, 17.x]
+        node-version: [12.x, 14.x, 16.x, 18.x]
     steps:
       - uses: actions/checkout@v2
         if: github.event.inputs.git-ref == ''