Pass fetch-depth: 2 to actions/checkout in check-autogen-diff

Author: MaxDesiatov

.github/workflows/main.yml

@@ -10,13 +10,14 @@ concurrency:
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
-  check-codegen-diff:
+  check-autogen-diff:
     runs-on: ubuntu-latest
-    name: "Verify auto-generated code is committed"
     container:
       image: swift:6.2-noble
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
       - name: Run auto-generated code checks
         run: |
           swift run --package-path Utilities WasmKitDevUtils wasmgen