chore(deps): bump actions/upload-artifact from 3 to 4 (#503)

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

.github/workflows/gateway-conformance.yml

@@ -71,15 +71,15 @@ jobs:
         # See https://github.com/ipfs/gateway-conformance/issues/171
         run: cat output.md | sed '/Failures\/Errors/,$d' >> $GITHUB_STEP_SUMMARY
       - name: Upload JSON output
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: conformance-${{ steps.slug.outputs.slug }}.json
           path: |
             ./output.json
             ./output.html
             ./report.json
       - name: Upload HTML report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: conformance-${{ steps.slug.outputs.slug }}.html
           path: output.html
@@ -113,7 +113,7 @@ jobs:
       - name: Upload Data Aggregates
         # This will be useful for local debugging
         if: (failure() || success())
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: dashboard-reports
           path: ./reports
@@ -124,7 +124,7 @@ jobs:
       - name: Upload Report
         # This will be useful for local debugging
         if: (failure() || success())
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: dashboard-report
           path: ./src/report.json