Merge pull request #31 from ruby/dependabot/github_actions/actions/checkout-6

Bump actions/checkout from 5 to 6

Author: hsbt

.github/workflows/build.yml

@@ -490,7 +490,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: |
             windows-toolchain.json