Bump actions/checkout from 4 to 5 (#31)

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout Python code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up private ssh key
         uses: webfactory/[email protected]

.github/workflows/run-centos7.yml

@@ -43,7 +43,7 @@ jobs:
 
     steps:
       - name: Checkout Python code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout OCaml facile library
         run: |

.github/workflows/run-tests.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout Python code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v5