ci(github): don't build and test on node 17 yet

eslint-plugin-jsdoc does not support node 17.

Author: djcsdy

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x]
+        node-version: [12.x, 14.x, 16.x]
     steps:
       - name: Find yarn cache
         id: find-yarn-cache