[skip ci] Fix GH-15810: Forgotten UPGRADING entry for Pdo_Pgsql::query. (#15811)

ref: GH-12476

Author: devnexen

UPGRADING

@@ -701,6 +701,8 @@ PHP 8.4 UPGRADE NOTES
 - PDO_PGSQL:
   . getAttribute() can now retrieve the memory usage of query results.
     PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE was added for this feature.
+  . If the column is of FLOAT4OID/FLOAT8OID type, query returns it as a
+    float instead of a string.
 
 - PGSQL:
   . pg_select, the conditions arguments accepts an empty array and is optional.