ci: drop Node 20 from matrix, migrate publish to Node 22 (#3414)

* Initial plan

* ci: drop Node 20 from test matrix, use Node 22 for publish, update docs

Agent-Logs-Url: https://github.com/h5bp/html5-boilerplate/sessions/fc3e7fbd-ad7f-461e-adc2-a467bd7c365b

Co-authored-by: roblarsen <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: roblarsen <[email protected]>

Author: Copilot

.github/workflows/publish.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
         with:
-          node-version: 20
+          node-version: 22
           registry-url: https://registry.npmjs.org/
       - name: publish npm
         run: npm publish

.github/workflows/test.yml

@@ -16,7 +16,6 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - 20
           - 22
           - 24
         os: [ubuntu-latest, windows-latest]

docs/about-this-repo.md

@@ -48,9 +48,8 @@ purposes.
 Our branch protection rules are as follows:
 
 - We require a pull request (PR) with one approving reviewer to merge code
-- In addition to the PR and approving reviewer, we require three status checks
+- In addition to the PR and approving reviewer, we require two status checks
   to pass before code can be merged
-  _ Build with Node 20
   _ Build with Node 22
   _ Build with Node 24
 - We _allow_ force pushes for project admins. While force pushes can create
@@ -62,7 +61,7 @@ Our branch protection rules are as follows:
 
 - We run a simple _build status_ check. This is the most basic test you can run
   and is absolutely vital. If you can't build your project you're in trouble.
-  Currently we're testing against Node 16 and 18.
+  Currently we're testing against Node 22 and 24.
 - We take advantage of our access to _CodeQL analysis_ Free for research and
   open source don't you know :) We don't have a ton of surface area to cover,
   but it's nice to have this powerful code scanning tool available to us.