Fix #6162: failed to build foundry-cheatcodes when enabling feature impls

[jacob-chia]

Motivation

• cmd: cargo build --package foundry-cheatcodes --features=impls
• error:

error[E0433]: failed to resolve: use of undeclared crate or module `foundry_compilers`
 --> crates/cheatcodes/src/impls/config.rs:4:5
  |
4 | use foundry_compilers::{utils::canonicalize, ProjectPathsConfig};
  |     ^^^^^^^^^^^^^^^^^ use of undeclared crate or module `foundry_compilers`

error[E0432]: unresolved import `foundry_compilers`
 --> crates/cheatcodes/src/impls/config.rs:4:5
  |
4 | use foundry_compilers::{utils::canonicalize, ProjectPathsConfig};
  |     ^^^^^^^^^^^^^^^^^ help: a similar path exists: `foundry_config::foundry_compilers`

Some errors have detailed explanations: E0432, E0433.
For more information about an error, try `rustc --explain E0432`.
warning: `foundry-cheatcodes` (lib) generated 1 warning
error: could not compile `foundry-cheatcodes` (lib) due to 2 previous errors; 1 warning emitted

Solution

Add the dependence foundry-compilers in feature impls

[mattsse]

thanks, this is now obsolete after

#6131