Bump actions/upload-artifact from 4 to 7 (#251)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/programming_team_code_ci.yml

@@ -90,7 +90,7 @@ jobs:
       run: sudo apt install -y texlive texlive-latex-extra rename
     - name: build pdf
       run: make --directory=tests/ build_pdf
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v7
       with:
         name: ptc
         path: tests/ptc.pdf