Bindings: incorrect version adding support for `type(Enum).min` and `type(Enum).max`

Solidity added support for `type(Enum).min` and `type(Enum).max` in [version 0.8.8](https://github.com/ethereum/solidity/releases/tag/v0.8.8), but our binding rules [incorrectly state](https://github.com/NomicFoundation/slang/blob/743d6b0c3271a9a2e86103dab18656650cd3f6a7/crates/solidity/inputs/language/bindings/rules.msgb#L2175) it's 0.6.8.