vulnerabilities and security issues

[chakravarthik27]

This pull request includes various changes to improve code readability, consistency, and formatting across multiple files. The most important changes include refactoring conditional expressions, updating dependencies, and removing unnecessary blank lines.

Refactoring conditional expressions:

• langtest/augmentation/base.py: Simplified the nested conditional expression in the fix method.
• langtest/langtest.py: Refactored multiple nested conditional expressions in the load_checkpoints method. [1] [2]
• langtest/utils/number_to_word.py: Simplified nested conditional expressions in the group3sub and number_to_words methods. [1] [2] [3]

Updating dependencies:

• pyproject.toml: Updated version constraints for tqdm, mlflow, and black. [1] [2]

Removing unnecessary blank lines:

• langtest/evaluation/__init__.py: Removed an unnecessary blank line in the aevaluate method.
• langtest/metrics/string_distance.py: Removed an unnecessary blank line in the StringDistance class.
• langtest/transform/security.py: Removed an unnecessary blank line in the SecurityTestFactory class.
• langtest/utils/benchmark_utils.py: Removed an unnecessary blank line in the Leaderboard class.
• langtest/utils/custom_types/sample.py: Removed an unnecessary blank line in the SecuritySample class.