ci: test on Node.js v16.x (#3205)

And upgrade `actions/setup-node` version.

.github/workflows/cdn.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 16.x
       - name: Install npm 7

.github/workflows/ci.yml

@@ -7,12 +7,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: ${{matrix.node-version}}
       - name: Install npm 7
@@ -29,7 +29,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 14.x
       - name: Install npm 7
@@ -46,7 +46,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 14.x
       - name: Install npm 7
@@ -63,7 +63,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 14.x
       - name: Install npm 7

.github/workflows/companion.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: ${{matrix.node-version}}
       - name: Install npm 7

.github/workflows/end-to-end.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 14.x
       - name: Install npm 7

.github/workflows/website.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v2-beta
+        uses: actions/setup-node@v2
         with:
           node-version: 14.x
       - name: Install npm 7