Bump the pip group across 1 directory with 4 updates

Bumps the pip group with 4 updates in the / directory: [transformers](https://github.com/huggingface/transformers), [langchain-core](https://github.com/langchain-ai/langchain), [mlflow](https://github.com/mlflow/mlflow) and [llama-index](https://github.com/run-llama/llama_index).


Updates `transformers` from 4.45.2 to 4.48.0
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.45.2...v4.48.0)

Updates `langchain-core` from 0.3.12 to 0.3.15
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.12...langchain-core==0.3.15)

Updates `mlflow` from 2.17.0 to 2.20.3
- [Release notes](https://github.com/mlflow/mlflow/releases)
- [Changelog](https://github.com/mlflow/mlflow/blob/master/CHANGELOG.md)
- [Commits](mlflow/mlflow@v2.17.0...v2.20.3)

Updates `llama-index` from 0.11.23 to 0.12.9
- [Release notes](https://github.com/run-llama/llama_index/releases)
- [Changelog](https://github.com/run-llama/llama_index/blob/main/CHANGELOG.md)
- [Commits](run-llama/llama_index@v0.11.23...v0.12.9)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: langchain-core
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: mlflow
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: llama-index
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]