Update checkout action version from v3 to v4

Author: softmattertheory

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: configure
       run:  |
         sudo apt update