Bump aioelectricitymaps to 0.4.0

[jpbede]

Proposed change

Bump aioelectricitymaps to 0.4.0, which performs some sanity checks before deserialization and otherwise raises an error.
This error will be dealt with in a follow up PR in the config flow.

https://github.com/jpbede/aioelectricitymaps/releases/tag/v0.4.0
jpbede/aioelectricitymaps@v0.3.1...v0.4.0

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[VIKTORVAV99]

LGTM!