feat: Introduce Node 18 (#360)

* Run the script

* 🦉 Updates from OwlBot post-processor

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

* Ran the linter

* Delete script

* Solve the npm-global error

npm error enoent ENOENT: no such file or directory, lstat '/h/.npm-global'

---------

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

Author: danieljbruce

core/promisify/.github/.OwlBot.lock.yaml

@@ -1,4 +1,4 @@
-# Copyright 2024 Google LLC
+# Copyright 2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,6 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 docker:
-  image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:0d39e59663287ae929c1d4ccf8ebf7cef9946826c9b86eda7e85d8d752dbb584
-# created: 2024-11-21T22:39:44.342569463Z
+  image: 'gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest'
+  digest: 'sha256:0d39e59663287ae929c1d4ccf8ebf7cef9946826c9b86eda7e85d8d752dbb584'

core/promisify/.github/sync-repo-settings.yaml

@@ -8,9 +8,9 @@ branchProtectionRules:
       - "ci/kokoro: Samples test"
       - "ci/kokoro: System test"
       - lint
-      - test (14)
-      - test (16)
       - test (18)
+      - test (20)
+      - test (22)
       - cla/google
       - windows
       - OwlBot Post Processor