The cdk library should always compile with any combination of features on Rust 1.66.0.
To build and test with the MSRV you will need to pin the below dependency versions:
cargo update -p home --precise 0.5.5
cargo update -p prost --precise 0.12.3
cargo update -p prost-types --precise 0.12.3
cargo update -p prost-build --precise 0.12.3
cargo update -p prost-derive --precise 0.12.3