Upgrade rubocop to version 1.31.1 (#151)
Upgrade rubocop to version 1.31.1 (#151)

Update rubocop to version 1.31.1

Co-authored-by: depfu[bot] <2714779d9417fc52c071749b76ce00064c1f90e7@users.noreply.github.com>
mkon/db_lock,mkon/db_lock