Bump actions/upload-artifact from 6 to 7 (#466)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-wheels.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Build sdist and wheel
         run: python -m build .
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           path: dist/*
 

.github/workflows/docs.yml

@@ -40,7 +40,7 @@ jobs:
           python -m sphinx -W -b html source/ build/html/
 
       - name: Upload documentation artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: documentation
           path: doc/build/html/

.github/workflows/test.yml

@@ -55,7 +55,7 @@ jobs:
           python -m pytest -n auto --cov=ufl/ --junitxml=junit/test-results-${{ inputs.os }}-${{ inputs.python-version }}.xml test/
 
       - name: Upload documentation artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: test-results-${{ inputs.os }}-${{ inputs.python-version }}
           path: junit/test-results-${{ inputs.os }}-${{ inputs.python-version }}.xml