Bump gui from 6c52c6b to 570c4e8 (#316)

Bumps [gui](https://github.com/openevse/openevse_wifi_gui) from `6c52c6b` to `570c4e8`.
- [Release notes](https://github.com/openevse/openevse_wifi_gui/releases)
- [Commits](OpenEVSE/openevse_wifi_gui@6c52c6b...570c4e8)

---
updated-dependencies:
- dependency-name: gui
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]