CI: drops Node.js v20, adds Node.js v26

Author: DougReeder

.github/workflows/test-and-lint.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         # Support LTS versions based on https://nodejs.org/en/about/releases/
-        node-version: ['20', '22', '24']
+        node-version: ['22', '24', '26']
       fail-fast: false
     steps:
       - uses: actions/checkout@v6.0.2