esp-config: potential license compatibility issue

[kaspar030]

esp-config depends on evalexpr, which unfortunately changed its license to AGPLv3 starting with version 12.0.0. As AGPLv3 is viral, I think esp-config cannot be MIT/Apache2 licensed as long as it depends on evalexpr.

The changes between the last released non-AGPLv3 version of evalexpr (11.3.1) and the current version are not that big, so as a short-term solution I suggest just pinning to 11.3.1.

[bugadani]

Unfortunately, we can't just pin 11.3.1 as it doesn't allow us to use i128 integers.

[AnthonyGrondin]

AGPL is like a cancer, once established, it's spreads everywhere in the system.

Meanwhile their PR template says that contributions are made under the MIT License.