Merge pull request #28439 from ocaml/update-gha-workflow

To avoid pulling the entire branch history, set `actions/checkout`'s `fetch-depth` to `2`

Author: smorimoto

.github/workflows/windows.yml

@@ -2,7 +2,7 @@ name: Windows CI
 on:
   push:
     branches:
-      - 'master'
+      - master
   pull_request:
 env:
   OPAMROOT: D:\opamroot
@@ -17,6 +17,8 @@ jobs:
     steps:
       - name: Checkout tree
         uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
 
       - name: Download install.ps1
         run: |