Update model metadata to set pipeline tag to the new `text-ranking` (#7)

- Update model metadata to set pipeline tag to the new `text-ranking` (f20afaa3970b3e7a54c3fee337cd6d8447b29933)


Co-authored-by: Tom Aarsen <[email protected]>

README.md

@@ -16,6 +16,7 @@ language:
 - te
 - th
 license: apache-2.0
+pipeline_tag: text-ranking
 ---
 
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