chore(deps): update actions/checkout action to v6 (#327)

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

Author: renovate[bot]

.github/workflows/main-workflow-template.yml

@@ -52,7 +52,7 @@ jobs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
     - name: Check out code 
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6 
@@ -75,7 +75,7 @@ jobs:
         ${{fromJson(needs.matrix_prep.outputs.matrix)}}
     steps:
       - name: Check out code 
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Make free space
         uses: ./.github/actions/make-free-space