fix: Fix incorrect context size for jina-reranker-v2 model (#7006)

api/core/model_runtime/model_providers/jina/rerank/jina-reranker-v2-base-multilingual.yaml

@@ -1,4 +1,4 @@
 model: jina-reranker-v2-base-multilingual
 model_type: rerank
 model_properties:
-  context_size: 8192
+  context_size: 1024