chore(deps): Bump github.com/spf13/pflag from 1.0.6-0.20210604193023-d5e0c0615ace to 1.0.6 in /exp/etcdrestore in the test-dependencies group

chore(deps): Bump github.com/spf13/pflag from 1.0.6-0.20210604193023-d5e0c0615ace to 1.0.6 in /exp/etcdrestore in the test-dependencies group #3935