Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...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]

.github/workflows/python-app.yml

@@ -115,14 +115,14 @@ jobs:
       if: always()
 
     - name: Save artifacts
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       if: always()
       with:
         name: test-artifacts-${{ matrix.python-version }}-${{ matrix.extension }}
         path: artifacts
 
     - name: Save golden files
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       if: always() && inputs.golden == true
       with:
         name: test-golden-${{ matrix.python-version }}-${{ matrix.extension }}