Bump gui from 295470d to 528cd18 (#267)

Bumps [gui](https://github.com/openevse/openevse_wifi_gui) from `295470d` to `528cd18`.
- [Release notes](https://github.com/openevse/openevse_wifi_gui/releases)
- [Commits](OpenEVSE/openevse_wifi_gui@295470d...528cd18)

---
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]