ci: run tests on latest node v22 (#14)

Execute tests also for node v22 to ensure functionality in latest active node version

Author: flovogt

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [16, 18, 20]
+        node-version: [16, 18, 20, 22]
     runs-on: ${{matrix.os}}
     steps:
     - uses: actions/checkout@v2