Fix dependency installation issues with Python 3.12

This report details the resolution of several dependency installation issues encountered when setting up the project with Python 3.12.

### 1. NumPy Build Failure

**Problem:**
When running `pip install .`, the installation failed during the build of `numpy==1.24.4` with the following error:
```
pip._vendor.pyproject_hooks._impl.BackendUnavailable: Cannot import 'setuptools.build_meta'
```

**Solution:**
This issue was resolved by upgrading the `numpy` dependency to a version compatible with Python 3.12. The `numpy` version was changed from `1.24.4` to `1.26.0` in both `pyproject.toml` and `requirements.txt`.

### 2. SentencePiece Build Failure

**Problem:**
After resolving the `numpy` issue, the installation failed again during the build of `sentencepiece==0.1.99`. The error indicated a problem with `cmake`:
```
Package 'sentencepiece', required by 'virtual:world', not found
CMake Error at CMakeLists.txt:15 (cmake_minimum_required):
Compatibility with CMake < 3.5 has been removed from CMake.
```

**Solution:**
This was fixed by upgrading `sentencepiece` to version `0.2.0`, which provides a pre-compiled wheel for Python 3.12 and doesn't require a local build with `cmake`. The change was made in both `pyproject.toml` and `requirements.txt`.

With these two changes, the `pip install .` command now completes successfully.