Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci_cd.yml

@@ -107,7 +107,7 @@ jobs:
       # pipeline secrets.
       # - name: "Upload server output"
       #  if: always()
-      #  uses: actions/upload-artifact@v3
+      #  uses: actions/upload-artifact@v4
       #  with:
       #    name: server_output
       #    path: tests/logs/*_log_*.txt
@@ -182,7 +182,7 @@ jobs:
           tox -e doc-linux
 
       - name: "Upload HTML Documentation"
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: documentation-html
           path: .tox/doc_out/html
@@ -197,7 +197,7 @@ jobs:
           tox -e doc-linux-pdf
 
       - name: "Upload PDF Documentation"
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: documentation-pdf
           path: .tox/doc_out/latex/ansys-dpf-composites.pdf