update "6.3" to "6.4"

Author: peterguy

docs/code_insights/explanations/current_limitations_of_code_insights.mdx

@@ -79,7 +79,7 @@ Code Insights does not yet support running over specific revisions.
 
 ## VCS limitations
 
-Code Insights by default can **not** query repositories that have [sub-repo permissions](/admin/permissions/api#Setting-sub-repository-permissions-for-users) configured. Note that some repositories can sync sub-repo permissions from the code host - Perforce depots currently (6.3).
+Code Insights by default can **not** query repositories that have [sub-repo permissions](/admin/permissions/api#Setting-sub-repository-permissions-for-users) configured. Note that some repositories can sync sub-repo permissions from the code host - Perforce depots currently (6.4).
 
 The reason for that restriction is security concerns around exposing the code in those repositories to users who should not be able to access it.