ci: Update node-version (#2365)

Update to the currently supported version.
https://github.com/nodejs/Release

* Add 24.x
* Drop 18.x

Author: abetomo

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x, 24.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps: