Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/documentation.yml

@@ -37,12 +37,12 @@ jobs:
           cd docs/build/latex
           latexmk -interaction=nonstopmode -pdf muse
       - name: Upload HTML
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: DocumentationHTML
           path: docs/build/html
       - name: Upload PDF
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: DocumentationPDF
           path: docs/build/latex/muse.pdf

.github/workflows/publish.yml

@@ -20,7 +20,7 @@ jobs:
           python -m pip install --upgrade build
           python -m build
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           path: dist/muse*
 
@@ -103,7 +103,7 @@ jobs:
       - name: Build directory-based standalone
         run: pyinstaller muse_dir.spec --distpath standalone
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           path: standalone/MUSE*
           name: MUSE