chore: revert previous node-version template changes in ci.yaml (#2387)

* chore: revert previous node-version template changes in ci.yaml

chore: revert previous node-version template changes

Source-Link: googleapis/synthtool@4b09ede
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:b612d739b0533e56ba174526ca339f264b63e911c30d6f83f55b57c38cc6ad2a

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: surbhigarg92 <surbhigarg.92@gmail.com>

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:66c44f0ad8f6caaa4eb3fbe74f8c2b4de5a97c2b930cee069e712c447723ba95
-# created: 2025-07-08T20:57:17.642848562Z
+  digest: sha256:b612d739b0533e56ba174526ca339f264b63e911c30d6f83f55b57c38cc6ad2a
+# created: 2025-08-15T12:36:48.871481111Z

.github/workflows/ci.yaml

@@ -11,7 +11,7 @@ jobs:
       matrix:
         node: [18, 20, 22, 24]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
@@ -29,10 +29,10 @@ jobs:
   test-script:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 18
       - run: node --version
       - run: npm install --engine-strict
         working-directory: .github/scripts
@@ -43,30 +43,30 @@ jobs:
   windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 18
       - run: npm install --engine-strict
       - run: npm test
         env:
           MOCHA_THROW_DEPRECATION: false
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 18
       - run: npm install
       - run: npm run lint
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 18
       - run: npm install
       - run: npm run docs
       - uses: JustinBeckwith/linkinator-action@v1

.github/workflows/issues-no-repro.yaml

@@ -10,10 +10,10 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 18
       - run: npm install
         working-directory: ./.github/scripts
       - uses: actions/github-script@v7

.github/workflows/response.yaml

@@ -13,7 +13,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/github-script@v7
         with:
           script: |
@@ -27,7 +27,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/github-script@v7
         with:
           script: |