Bump actions/checkout from 6.0.2 to 7.0.0 (#382)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
       - run: docker pull exercism/sml-test-runner
       - name: Run tests for all exercises
         run: sh ./bin/test