Use NodeJS 20 (LTS) as default for tests

.github/workflows/browser-beta.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install Firefox beta
       uses: browser-actions/setup-firefox@latest
       with:

.github/workflows/browser-dev.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install Firefox latest dev edition
       uses: browser-actions/setup-firefox@latest
       with:

.github/workflows/lint.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}

.github/workflows/linux.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install Firefox
       uses: browser-actions/setup-firefox@latest
       #with:

.github/workflows/mac.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install browsertime
       run: npm ci
     - name: Install python

.github/workflows/safari.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install browsertime
       run: npm ci
     - name: Install python

.github/workflows/windows.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Use Node.js
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
     - name: Install Browsertime
       run: npm ci
     - name: Install dependencies