update_from_4.5.md: Add ibexa-4.5.5-to-4.5.6.sql (#2647)

Author: adriendupuis

docs/update_and_migration/from_4.5/update_from_4.5.md

@@ -86,6 +86,32 @@ Run the following scripts:
     psql <database_name> < vendor/ibexa/installer/upgrade/db/postgresql/ibexa-4.5.3-to-4.5.4.sql
     ```
 
+### v4.5.5
+
+No additional steps needed.
+
+### v4.5.6
+
+#### Database update
+
+Run the following scripts:
+
+=== "MySQL"
+
+    ``` bash
+    mysql -u <username> -p <password> <database_name> < vendor/ibexa/installer/upgrade/db/mysql/ibexa-4.5.5-to-4.5.6.sql
+    ```
+
+=== "PostgreSQL"
+
+    ``` bash
+    psql <database_name> < vendor/ibexa/installer/upgrade/db/postgresql/ibexa-4.5.5-to-4.5.6.sql
+    ```
+
+### v4.5.7
+
+No additional steps needed.
+
 ## Update from v4.5.latest to v4.6
 
 When you have the latest version of v4.5, you can update to v4.6.