Bump actions/upload-artifact from 2 to 3 (#97)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v3)

---
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/ci.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Run Tests
         run: make unit-test
       - name: Upload Coverage Report
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: cover-${{ needs.vars.outputs.sha }}.html
           path: ${{ github.workspace }}/cover.html
@@ -146,7 +146,7 @@ jobs:
         with:
           sarif_file: 'trivy-results-nginx-kubernetes-gateway.sarif'
       - name: Upload Scan Results
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         continue-on-error: true
         with:
           name: 'trivy-results-nginx-kubernetes-gateway.sarif'