Revert "feat: upgrade Lighthouse and node (#422)"

This reverts commit be93d56.

Author: FawazFarid

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x, '*']
+        node-version: [12.x, '*']
 
     steps:
       - uses: actions/checkout@v3

netlify.toml

@@ -3,7 +3,7 @@ command = "echo 'no op'"
 publish = "example"
 
 [build.environment]
-NODE_VERSION = "16.15.1"
+NODE_VERSION = "node"
 
 [[plugins]]
 package = "./src/index.js"