This commit introduces the use of the `Encode` module to ensure that
values being processed in the `WriteReadings` subroutine are correctly
encoded in UTF-8. The previous implementation did not account for
potential non-UTF-8 encoded data which could lead to issues when
updating readings.
The change specifically checks if the value (`$v`) is marked as UTF-8
using `Encode::is_utf8()`. If it is, the value is re-encoded to UTF-8
before being passed to `::readingsBulkUpdate()`. This adjustment
ensures that all data written to readings maintains proper character
encoding, improving compatibility and preventing potential data
corruption.
No breaking changes are introduced, but it is important for users
to validate that their readings correctly display any special
characters post-update.
