chore(deps): update actions/checkout action to v6 (#787)

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

Author: renovate[bot]

extensions/gubbins/.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
           - gubbins-cli
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: prefix-dev/setup-pixi@v0.8.8
         with:
           run-install: false
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: prefix-dev/setup-pixi@v0.8.8
         with:
           run-install: false