chore(deps): bump actions/upload-artifact from 4 to 7 (#30)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v4...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>

.github/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
           if echo "$NEEDED" | grep -q 'libkernel\.so'; then echo "FORBIDDEN: app-world libkernel.so"; exit 1; fi
           echo "linkage OK"
       - name: upload test-build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: orbisrpc-test-build
           path: build-sdk/orbisrpc_sdk.elf