Bump actions/upload-artifact from 5 to 6 (#1007)

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

Author: dependabot[bot]

.github/workflows/deploy-code.yml

@@ -35,7 +35,7 @@ jobs:
         run: pip install -U pip setuptools virtualenv wheel
       - name: Build sdist
         run: python3 setup.py sdist bdist_wheel
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           path: ./dist/*
       - name: Deploy to Pypi

.github/workflows/main.yml

@@ -98,7 +98,7 @@ jobs:
         if: ${{ !cancelled() }}
         shell: bash
       - name: Run upload documentation
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: documentation
           path: docs/_build/html/artifacts/documentation.tar.gz
@@ -163,7 +163,7 @@ jobs:
           mv .coverage ./ci-artifact-data/ml.dat
         if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10' }}
         shell: bash
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }}-${{ matrix.python-version }}
           path: ./ci-artifact-data/*
@@ -221,7 +221,7 @@ jobs:
           tar -zcvf artifacts/tutorials.tar.gz --exclude=./artifacts .
         shell: bash
       - name: Run upload tutorials
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: tutorials${{ matrix.python-version }}
           path: docs/_build/html/artifacts/tutorials.tar.gz
@@ -250,7 +250,7 @@ jobs:
         if: ${{ matrix.python-version == '3.10' && !startsWith(github.ref, 'refs/heads/stable') && !startsWith(github.base_ref, 'stable/') }}
         shell: bash
       - name: Run upload stable tutorials
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: tutorials-stable${{ matrix.python-version }}
           path: docs/_build/html/artifacts/tutorials.tar.gz