Update actions/checkout action to v6 (#132)

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

Author: renovate[bot]

.github/workflows/ruff.yml

@@ -10,6 +10,6 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: pip install --user ruff
     - run: ruff check --output-format=github --target-version=py38 .

.github/workflows/update-swagger.yml

@@ -8,7 +8,7 @@ jobs:
   updateSwagger:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Get Latest Swagger UI Release
         id: swagger-ui
         run: |