Bump llama-index from 0.12.23 to 0.12.28 in /components/common_ml

Bumps [llama-index](https://github.com/run-llama/llama_index) from 0.12.23 to 0.12.28.
- [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@v0.12.23...v0.12.28)

---
updated-dependencies:
- dependency-name: llama-index
  dependency-version: 0.12.28
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

components/common_ml/requirements.txt

@@ -2,6 +2,6 @@ google-cloud-aiplatform==1.84.0
 langchain==0.3.20
 langchain-community==0.3.19
 langchain-core==0.3.45
-llama-index==0.12.23
+llama-index==0.12.28
 sentence-transformers==3.4.1
 rerankers==0.8.0