ci: use lts/iron (Node.js 20 LTS)

Author: panva

.github/workflows/conformance.yml

@@ -115,7 +115,7 @@ jobs:
       - run: git clone --depth 1 --single-branch --branch main https://github.com/panva/openid-client-certification-suite.git runner
       - uses: actions/setup-node@v4
         with:
-          node-version: lts/hydrogen # 18
+          node-version: lts/iron # 20
           cache: 'npm'
       - run: npm clean-install
         working-directory: ./runner

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: lts/hydrogen # 18
+          node-version: lts/iron # 20
           registry-url: https://registry.npmjs.org
           always-auth: true
       - run: npm publish --provenance
@@ -50,7 +50,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: lts/hydrogen # 18
+          node-version: lts/iron # 20
           cache: 'npm'
       - run: node .release-notes.cjs
         env:

.github/workflows/test.yml

@@ -24,6 +24,7 @@ jobs:
           - lts/fermium # 14
           - lts/gallium # 16
           - lts/hydrogen # 18
+          - lts/iron # 20
           - current
     steps:
       - name: Checkout
@@ -51,7 +52,7 @@ jobs:
         uses: actions/setup-node@v4
         id: node
         with:
-          node-version: lts/hydrogen # 18
+          node-version: lts/iron # 20
           cache: 'npm'
           check-latest: true
       - name: Install dependencies
@@ -68,7 +69,7 @@ jobs:
       - uses: actions/setup-node@v4
         id: node
         with:
-          node-version: lts/hydrogen # 18
+          node-version: lts/iron # 20
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install