Revert "CI: Remove redundant checkout step in Windows Patches job"

This reverts commit 8fcdfb815f.

This checkout is not redundant. It is required so that the
windows-patches action files can actually be found.

.github/workflows/publish.yaml

@@ -180,6 +180,7 @@ jobs:
     if: github.repository_owner == 'obsproject' && fromJSON(needs.check-tag.outputs.validTag)
     runs-on: windows-latest
     steps:
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/windows-patches
         with:
           tagName: ${{ github.ref_name }}