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

@@ -1,5 +1,5 @@
 ---
-pipeline_tag: sentence-similarity
+pipeline_tag: text-ranking
 language: fr
 datasets:
 - stsb_multi_mt
@@ -12,17 +12,17 @@ license: apache-2.0
 model-index:
 - name: sentence-camembert-base by Van Tuan DANG
   results:
-  - task: 
-      name: Sentence-Embedding
+  - task:
       type: Text Similarity
+      name: Sentence-Embedding
     dataset:
       name: Text Similarity fr
       type: stsb_multi_mt
       args: fr
     metrics:
-       - name: Test Pearson correlation coefficient
-         type: Pearson_correlation_coefficient
-         value:  xx.xx
+    - type: Pearson_correlation_coefficient
+      value: xx.xx
+      name: Test Pearson correlation coefficient
 ---
 
 ## Model