chore: bump cargo-mono to 0.6.7 (#380)

## Summary
- bump `cargo-mono` from `0.6.6` to `0.6.7`
- update the workspace lockfile package entry to match the crate version

## Testing
- `cargo test`

Author: kdy1

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-mono"
-version = "0.6.6"
+version = "0.6.7"
 edition = "2021"
 license = "MIT"
 description = "Cargo subcommand for Rust monorepo management"