Update dependencies in Cargo.lock and refactor code for improved performance

- Downgraded several dependencies including `ahash`, `anstyle-wincon`, `backtrace`, `bitflags`, `bytemuck`, `chrono`, `clap`, `cc`, `getrandom`, `rand`, `tokio`, and others to specific versions for compatibility.
- Updated checksums for modified packages to ensure integrity.
- Refactored code in `markdown_processor.rs` to streamline chunk processing.
- Simplified cloning of embeddings in `cohere.rs` and adjusted normalization in `clip.rs` for better efficiency.

Author: akshayballal95