Bump actions/checkout from 5.0.0 to 6.0.0 (#713)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - &checkout
         name: Check out code from GitHub
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
       - &setup-python-default
         name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
       contents: write  # Required to upload release assets
     steps:
       - name: Check out code from Github
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
         uses: actions/[email protected]