Update actions/checkout action to v5

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/gnul.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout the codebase in local working directory
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup a functioning local Python 3 installation
         uses: actions/setup-python@v5

.github/workflows/mswn.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout the codebase in local working directory
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup a functioning local Python 3 installation
         uses: actions/setup-python@v5