[ci] Fix sparse_solver for pylint. (#3132)
[ci] Fix sparse_solver for pylint. (#3132)

There was a race condition between I enable pylint check and another PR
merging. :P This PR fixes it to make sure master passes pylint check.
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi