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

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

Author: renovate[bot]

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     container: fedorapython/fedora-python-tox:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install the base dependencies
         run: |
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     container: fedorapython/fedora-python-tox:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install the base dependencies
         run: |