build,tools: gitHub Actions: use Node.js Fermium

PR-URL: https://github.com/nodejs/node/pull/35840
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

.github/workflows/auto-start-ci.yml

@@ -9,6 +9,9 @@ on:
     # ./doc/guides/commit-queue.md
     - cron: "*/5 * * * *"
 
+env:
+  NODE_VERSION: 14.x
+
 jobs:
   startCI:
     if: github.repository == 'nodejs/node'
@@ -20,7 +23,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v2-beta
         with:
-          node-version: '12'
+          node-version: ${{ env.NODE_VERSION }}
       - name: Install node-core-utils
         run: npm install -g node-core-utils
 

.github/workflows/commit-queue.yml

@@ -14,6 +14,9 @@ on:
   schedule:
     - cron: "*/5 * * * *"
 
+env:
+  NODE_VERSION: 14.x
+
 jobs:
   commitQueue:
     if: github.repository == 'nodejs/node'
@@ -34,7 +37,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v2-beta
         with:
-          node-version: '12'
+          node-version: ${{ env.NODE_VERSION }}
       - name: Install node-core-utils
         run: npm install -g node-core-utils@latest
 

.github/workflows/linters.yml

@@ -10,7 +10,7 @@ on:
 
 env:
   PYTHON_VERSION: 3.9
-  NODE_VERSION: 10.x
+  NODE_VERSION: 14.x
 
 jobs:
   lint-addon-docs:

.github/workflows/misc.yml

@@ -9,7 +9,7 @@ on:
       - v[0-9]+.x
 
 env:
-  NODE_VERSION: 12.x
+  NODE_VERSION: 14.x
 
 jobs:
   build-docs: