chore: update Node.js version to 22 and upgrade undici dependency

.github/workflows/ci.yml

@@ -134,14 +134,11 @@ jobs:
   build:
     name: Build
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node-version: [20, 22]
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: 22
           cache: npm
       - run: npm ci
       - run: npm run build
@@ -151,9 +148,6 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     needs: build
-    strategy:
-      matrix:
-        node-version: [20, 22]
     env:
       JWT_SECRET: ci-test-secret-with-sufficient-length-for-validation
       API_KEY_SECRET: ci-test-api-key-secret-long
@@ -161,7 +155,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: 22
           cache: npm
       - run: npm ci
       - run: npm run test:unit