Use latest Actions

Author: benmwebb

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup conda
@@ -39,6 +39,6 @@ jobs:
         make
         ./setup_environment.sh pytest --cov=.. --cov-branch --cov-report=xml -v ../test/test_*.py test/*/*.py
         ${GCC/gcc/gcov} */*/*/*.gcno
-    - uses: codecov/codecov-action@v5
+    - uses: codecov/codecov-action@v6
       with:
         token: ${{ secrets.CODECOV_TOKEN }}