Use latest checkout Action

Author: benmwebb

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         submodules: true
     - name: Setup conda and dependencies