chore: use node 14 for GitHub Actions (#570)

Author: CsCherrYY

.github/workflows/linux.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Setup Node.js environment
       uses: actions/setup-node@v2
       with:
-        node-version: 12
+        node-version: 14
 
     - name: Install Node.js modules
       run: npm install

.github/workflows/linuxUI.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Setup Node.js environment
       uses: actions/setup-node@v2
       with:
-        node-version: 12
+        node-version: 14
 
     - name: Install Node.js modules
       run: npm install

.github/workflows/macOS.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup Node.js environment
       uses: actions/setup-node@v2
       with:
-        node-version: 12
+        node-version: 14
 
     - name: Install Node.js modules
       run: npm install

.github/workflows/windows.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup Node.js environment
       uses: actions/setup-node@v2
       with:
-        node-version: 12
+        node-version: 14
 
     - name: Install Node.js modules
       run: npm install

.github/workflows/windowsUI.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup Node.js environment
       uses: actions/setup-node@v2
       with:
-        node-version: 12
+        node-version: 14
 
     - name: Install Node.js modules
       run: npm install