Cache not removing expired items

Shouldn't the [janitor](https://github.com/bepass-org/dnsutils/blob/main/internal/cache/cache.go#L118) call [`DeleteExpired`](https://github.com/bepass-org/dnsutils/blob/main/internal/cache/cache.go#L87) method? Currently expired items are always available. They never get cleaned, [janitor](https://github.com/bepass-org/dnsutils/blob/main/internal/cache/cache.go#L124) only calls `onExpired` callback. I think it should also call `DeleteExpired`.

Start in internal/cache/cache.go at the janitor and DeleteExpired entry points linked in the issue. Confirm how the janitor handles expired items and ensure the completed behavior removes them so they are no longer available.

Written by the indexing model from the issue text.