build(deps): bump actions/upload-artifact from 4 to 5

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/gh-pages.yml

@@ -50,7 +50,7 @@ jobs:
           cmake --build . --config Release --target doc
 
       - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: site
           path: build/doc/doxygen-html

.github/workflows/release-linux.yml

@@ -53,7 +53,7 @@ jobs:
 
       - run: echo "ARTIFACT_NAME=dist-${{ matrix.arch }}-${{ matrix.build }}" | sed 's/\*/_/g' >> $GITHUB_ENV
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: ${{ env.ARTIFACT_NAME }}
           path: dist

.github/workflows/release-osx-win.yml

@@ -84,7 +84,7 @@ jobs:
           mv dist/proxsuite*.whl dist_proxsuite
 
       - name: Archive artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: dist-${{ matrix.os }}-${{ matrix.python-version }}
           path: dist_proxsuite