maint: bump actions/upload-artifact from 4.3.6 to 4.4.0 (#497)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4.3.6 to 4.4.0.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4.3.6...v4.4.0)

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

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

Author: dependabot[bot]

.github/workflows/nightly-build.yml

@@ -42,14 +42,14 @@ jobs:
           make -C doc pdf
 
       - name: Upload HTML documentation
-        uses: actions/upload-artifact@v4.3.6
+        uses: actions/upload-artifact@v4.4.0
         with:
           name: HTML-Documentation
           path: .tox/doc_out_html/
           retention-days: 7
 
       - name: Upload PDF Documentation
-        uses: actions/upload-artifact@v4.3.6
+        uses: actions/upload-artifact@v4.4.0
         with:
           name: PDF-Documentation
           path: doc/build/latex/pyansys*.pdf