ci: test on Node.js 22 and 24

The test matrix only covers Node.js 20, but the package declares
engines >= 20. Add the two current LTS versions (22 and 24) so
regressions on newer runtimes are caught before release.

Author: costajohnt

.github/workflows/test.yml

@@ -8,6 +8,8 @@ jobs:
       matrix:
         node_version:
           - 20
+          - 22
+          - 24
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node_version }}