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] <support@github.com>

.github/workflows/main.yml

@@ -107,7 +107,7 @@ jobs:
         id: date
         run: echo "date=$(date +'%Y-%m-%dT%H_%M_%S')" >> $GITHUB_OUTPUT #no colons allowed for artifacts
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: unit_results_${{ matrix.python-version }}-${{ steps.date.outputs.date }}.csv
@@ -156,7 +156,7 @@ jobs:
           if [[ "$(ls -lh dist/)" == *"a1"* ]]; then export is_alpha=1; fi
           echo "is_alpha=$is_alpha" >> $GITHUB_OUTPUT
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: dist
           path: dist/