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/tests.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     container: fedorapython/fedora-python-tox:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install pre-commit
         run: |
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     container: fedorapython/fedora-python-tox:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install RPM dependencies
         run: |
@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-latest
     container: fedorapython/fedora-python-tox:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install RPM dependencies
         run: |
@@ -101,7 +101,7 @@ jobs:
 
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with: