Update model metadata to set pipeline tag to the new `text-ranking`

Hello!

## Pull Request overview
* Update metadata to set pipeline tag to the new `text-ranking`

## Changes
This is an automated pull request to update the metadata of the model card. We recently introduced the [`text-ranking`](https://huggingface.co/models?pipeline_tag=text-ranking) pipeline tag for models that are used for ranking tasks, and we have a suspicion that this model is one of them.

Feel free to respond if you have questions or concerns.

- Tom Aarsen

README.md

@@ -1,14 +1,14 @@
 ---
 language:
-  - ko
-  - en
-  - zh
+- ko
+- en
+- zh
 license: mit
-pipeline_tag: feature-extraction
+pipeline_tag: text-ranking
 tags:
-  - transformers
-  - sentence-transformers
-  - text-embeddings-inference
+- transformers
+- sentence-transformers
+- text-embeddings-inference
 ---