CI: update checkout action to avoid Node warning

Author: davidjb

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
             dynamic_module: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install prerequisites
         run: |
           sudo apt install -y git wget gcc cmake