Bump node to version 20 in all workflows

Co-authored-by: rzhao271 <7199958+rzhao271@users.noreply.github.com>

Author: Copilot

.github/workflows/dev-containers.yml

@@ -20,7 +20,7 @@ jobs:
     - uses: actions/checkout@v6
     - uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         registry-url: 'https://npm.pkg.github.com'
         scope: '@microsoft'
     - name: Install Dependencies
@@ -70,7 +70,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         registry-url: 'https://npm.pkg.github.com'
         scope: '@microsoft'
     - name: Disable containerd image store
@@ -117,7 +117,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         registry-url: 'https://npm.pkg.github.com'
         scope: '@microsoft'
     - name: Install Dependencies

.github/workflows/publish-dev-containers.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         registry-url: 'https://registry.npmjs.org'
         scope: '@devcontainers'
     - name: Verify Versions

.github/workflows/test-docker-v20.yml

@@ -19,7 +19,7 @@ jobs:
 
     - uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
 
     - name: Install Docker v20.10
       run: |

.github/workflows/test-docker-v29.yml

@@ -19,7 +19,7 @@ jobs:
 
     - uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
 
     - name: Install Docker v29.0.0
       run: |

.github/workflows/test-windows.yml

@@ -54,7 +54,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v5
       with:
-        node-version: '18.x'
+        node-version: '20.x'
         registry-url: 'https://npm.pkg.github.com'
         scope: '@microsoft'
     - name: Install Dependencies