[ci] Fix node-bench-regression-guard job (#2732)
After GitLab update it started to remove artifacts from master if PR has more than 20 commits. PR fixes this for `node-bench-regression-guard` job cc https://github.com/paritytech/ci_cd/issues/915
After GitLab update it started to remove artifacts from master if PR has more than 20 commits. PR fixes this for `node-bench-regression-guard` job cc https://github.com/paritytech/ci_cd/issues/915