chore(ci): deprecate node 12 (#41585)

.github/workflows/cypress.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         browsers: [chrome, firefox]
-        node-version: [14.x, 12.x]
+        node-version: [14.x]
     services:
       mongodb:
         image: mongo:3.6.19

.github/workflows/lighthouse-ci.yml

@@ -21,7 +21,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 12.x]
+        node-version: [14.x]
 
     steps:
       - name: Checkout Source Files

.github/workflows/node.js-tests-upcoming.yml

@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 12.x]
+        node-version: [14.x]
 
     steps:
       - name: Checkout Source Files

.github/workflows/node.js-tests.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 12.x]
+        node-version: [14.x]
 
     steps:
       - name: Checkout Source Files