Increase nodejs version to 14.17 to fix incompatibility

with vsce:

/Users/runner/hostedtoolcache/node/12.12.0/x64/lib/node_modules/vsce/out/package.js:136
    return (translations ?? [])
                          ^

SyntaxError: Unexpected token '?'
    at Module._compile (internal/modules/cjs/loader.js:892:18)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:849:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/Users/runner/hostedtoolcache/node/12.12.0/x64/lib/node_modules/vsce/out/main.js:27:19)
    at Module._compile (internal/modules/cjs/loader.js:956:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)

[Build]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.12'
+        node-version: '14.17'
     - name: Install dependencies
       run: npm install
     - name: Build

.github/workflows/pre-release.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.12'
+        node-version: '14.17'
     - name: Get current version
       id: version
       run: echo "::set-output name=version::$(jq -r .version package.json)"

.github/workflows/release-nightly.yml

@@ -30,7 +30,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.12'
+        node-version: '14.17'
     - name: Prepare nightly
       run: |
         .github/workflows/nightly.sh
@@ -42,7 +42,6 @@ jobs:
       run: |
         npm install
         npm install -g vsce
-        npm install -g npx
     - name: Build
       run: |
         npm run vscode:prepublish

.github/workflows/release.yml

@@ -9,15 +9,14 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.12'
+        node-version: '14.17'
     - name: Get current version
       id: version
       run: echo "::set-output name=version::$(jq -r .version package.json)"
     - name: Install dependencies
       run: |
         npm install
         npm install -g vsce
-        npm install -g npx
     - name: Build
       run: |
         npm run vscode:prepublish