refactor: `type/strslices`: copy from `type/stringsutil`

chore(deps): go mod: update

chore(deps): go mod: update

chore(lint): `golangci-lint`: fix various

refactor: `encoding/jsonutil`: update callers

docs: `README.md`: update shield

chore(lint): fix various

chore(license): update years

feat: `type/slicesutil`: add `AppendBulk()`

feat: `time/timeutil`: add `TimeUpdateLocation()`