Update makefile.yml

Use latest checkout action (v4)

Author: Ned Smith

.github/workflows/makefile.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: checkout repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: recursive
     - name: install tools