chore(deps): update dependency sentence-transformers to v6

Author: renovate[bot]

Build/reranker/requirements.txt

@@ -5,4 +5,4 @@
 # the full resolved tree, which is what makes the build reproducible. Change a
 # version here, then regenerate the lock (command in its header).
 torch==2.13.0
-sentence-transformers==5.7.0
+sentence-transformers==6.0.0