chore(workflow): add node-26 to test matrix

Author: erisu

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x, 22.x, 24.x]
+        node-version: [20.x, 22.x, 24.x, 26.x]
         os: [ubuntu-latest, windows-latest, macos-26]
 
     steps: