use node 21 on ci

Author: zloirock

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
-          node-version: 20
+          node-version: 21
           cache: npm
       - uses: actions/setup-python@v4
         with:
@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
-          node-version: 20
+          node-version: 21
           cache: npm
       - run: npm ci
       - run: npx run-s bundle test-unit-karma
@@ -38,6 +38,7 @@ jobs:
         node:
           - 18.12
           - 20
+          - 21
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -58,6 +59,7 @@ jobs:
         node:
           - 18.12
           - 20
+          - 21
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4