Update kernel-build.yml to use node.js 20

Upgrade the actions to v4 to get rid of the warning about migrating from node.js 16.

Author: pelwell

.github/workflows/kernel-build.yml

@@ -69,7 +69,7 @@ jobs:
         fi
       timeout-minutes: 5
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 1
         clean: true
@@ -101,7 +101,7 @@ jobs:
       run: tar -cvf ${{matrix.name}}_build.tar -C ${{github.workspace}}/install .
 
     - name: Upload results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{matrix.name}}_build
         path: ${{matrix.name}}_build.tar