Update sentence bert config to 4096

By default many users will not have the sliding window installed. This setting sets a preferred cix windows of 4096

sentence_bert_config.json

@@ -1,4 +1,4 @@
 {
-  "max_seq_length": 32768,
+  "max_seq_length": 4096,
   "do_lower_case": false
 }