Change checksum log level

[gigatexel]

Checksum errors are currently mapped as a "warning" by the logger.

This is unwanted in most cases:

• Checksum errors tend to happen, sporadically. However, the end user cannot take any action to avoid these sporadic errors and subsequent telegrams are always error-free. The issue solves itself.
• Errors that are thrown as "warning" do appear in front-end systems, such as Home Assistant. This could cause questions and confusion with end-users that are worried by these warnings.
• Structural issues in communication require specific investigation by power users. These users are keen enough to level up the default error level from "warning" to, for example, "info"

[ndokter]

Thanks for the contribution, i will make a new release in the future