Fix SDK update workflow (#4890)

- Checkout the dev branch.
- Use the SHA that for the v3.1.1 tag.

.github/workflows/update-sdk.yml

@@ -20,8 +20,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: martincostello/update-dotnet-sdk@31f3d5a6c2c4a5a0b7eb0e0d5c30501925d6e790
+      with:
+        ref: dev
+    - uses: martincostello/update-dotnet-sdk@b3d5ca8064ec275f7a1d0b9640d28a57ab94090b
       with:
         quality: 'daily'
         repo-token: ${{ secrets.GITHUB_TOKEN }}
-        branch-name: dev