Bump `k256` from `0.10.4` to `0.11.4` (#12085)

* Bump `k256` from `0.10.4` to `0.11.4`

* Update Cargo.lock

* Update

Co-authored-by: Bastian Köcher <info@kchr.de>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>