hotfix: database compatibility with older Magento 2.3 releases

Author: Code Slicer

etc/db_schema.xml

@@ -5,7 +5,7 @@
         <column name="message_id" xsi:type="int" unsigned="true" nullable="false" identity="true"/>
         <column name="job_class" xsi:type="varchar" nullable="false"/>
         <column name="target" xsi:type="varchar" nullable="true"/>
-        <column name="additional_data" xsi:type="json" nullable="true"/>
+        <column name="additional_data" xsi:type="text" nullable="true"/>
         <constraint xsi:type="primary" referenceId="PRIMARY">
             <column name="message_id"/>
         </constraint>