bump actions/upload-artifact from 4 to 7 in /sign-pkg-windows

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

sign-pkg-windows/action.yaml

@@ -88,7 +88,7 @@ runs:
                "${{ env.installer }}"
 
     - name: Post the installer
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: "Windows-installer"
         path: ${{ env.installer }}