downgrade to node 16 to avoid ssl issue (for now)

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [18.x]
+        node-version: [16.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -78,7 +78,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        node-version: [18.x]
+        node-version: [16.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -157,7 +157,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        node-version: [18]
+        node-version: [16]
         browser: [chrome, firefox]
 
     container: