Bump actions/upload-artifact from 4 to 5 (#33)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/PDFs.yml

@@ -45,7 +45,7 @@ jobs:
       - run: julia --color=yes pdf/make.jl ${{ matrix.buildtype }}
         env:
           DOCUMENTER_LATEX_DEBUG: ${{ github.workspace }}/latex-debug-logs
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         if: ${{ always() }}
         with:
           name: "LaTeX source and logs (${{ matrix.buildtype }})"