Update github actions.

Author: dlongley

.github/workflows/main.yaml

@@ -8,11 +8,11 @@ jobs:
     timeout-minutes: 10
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [24.x]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm install