Merge pull request #28943 from ocaml/dependabot/github_actions/actions/checkout-6

Bump actions/checkout from 5 to 6

Author: mseri

.github/workflows/windows.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout tree
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2