fix(v2): correct eventstore query (#8124)

# Which Problems Are Solved

Postgres versions < 16 require an alias for subqueries. The query
executed in the new eventstore didn't add this alias.

# How the Problems Are Solved

Added the alias to the subquery

internal/v2/eventstore/postgres/query.go

@@ -86,7 +86,7 @@ func writeQuery(stmt *database.Statement, query *eventstore.Query) {
 
 	stmt.WriteString(" FROM (")
 	writeFilters(stmt, query.Filters())
-	stmt.WriteRune(')')
+	stmt.WriteString(") sub")
 	writePagination(stmt, query.Pagination())
 }