chore(tests/lean/run/test_single): use '-j 0' when running tests
chore(tests/lean/run/test_single): use '-j 0' when running tests

rlewis1988/lean,johoelzl/lean,avigad/lean,Kha/lean,Kha/lean,leanprover-community/lean,fgdorais/lean,digama0/lean,fpvandoorn/lean,leodemoura/lean,fgdorais/lean,rlewis1988/lean,leanprover/lean,leodemoura/lean,leanprover/lean,digama0/lean,johoelzl/lean,leanprover-community/lean,dselsam/lean,fpvandoorn/lean,avigad/lean,dselsam/lean,fgdorais/lean,fpvandoorn/lean,leanprover-community/lean,leanprover-community/lean,digama0/lean,fpvandoorn/lean,Kha/lean,dselsam/lean,leodemoura/lean,avigad/lean,digama0/lean,dselsam/lean,leanprover/lean,avigad/lean,Kha/lean,rlewis1988/lean,rlewis1988/lean,rlewis1988/lean,dselsam/lean,leodemoura/lean,dselsam/lean,Kha/lean,leanprover-community/lean,johoelzl/lean,leanprover/lean,fgdorais/lean,avigad/lean,leodemoura/lean,avigad/lean,leanprover-community/lean,digama0/lean,fpvandoorn/lean,leodemoura/lean,fgdorais/lean,leanprover/lean,leanprover/lean,rlewis1988/lean,johoelzl/lean,johoelzl/lean,Kha/lean,johoelzl/lean,fpvandoorn/lean,fgdorais/lean,digama0/lean