feat: upgrade to Node v22 (LTS); drop v18, v20 (#497)

Author: sebastiaanspeck

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [22.x, 23.x, 24.x]
 
     name: Node ${{ matrix.node-version }} - ${{ matrix.os }}