Fix the coverage fail on CI

[pythonbrad]

Problem

The coverage fail on CI

Error

   error: failed to compile `grcov v0.8.19`, intermediate artifacts can be found at `/tmp/cargo-installx0ETEC`.
  To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
  
  Caused by:
    package `clap_lex v0.7.0` cannot be built because it requires rustc 1.74 or newer, while the currently active rustc version is 1.72.1
    Try re-running cargo install with `--locked`

[pythonbrad]

fixed through #178