fix: Update default charset and collation for mysql - EXO-75202

With mysql 8.4, the default charset and collation are updated from UTF to UTF8MB4. In addition NVARCHAR is now deprecated and replaced by VARCHAR.
This commit adapt liquibase changes in order to apply this change.

Resolves Meeds-io/meeds#2564

poll-services/src/main/resources/db/changelog/poll-rdbms.db.changelog-1.0.0.xml

@@ -33,11 +33,13 @@
   </changeSet>
 
   <changeSet author="poll" id="1.0.0-1">
+    <validCheckSum>9:6c06bd4c9da244943d8802ab0f5bdfd7</validCheckSum>
+    <validCheckSum>9:19de057d5accde689dd4a2923ba2776d</validCheckSum>
     <createTable tableName="POLL">
       <column name="POLL_ID" type="BIGINT" autoIncrement="${autoIncrement}" startWith="1">
         <constraints nullable="false" primaryKey="true" primaryKeyName="PK_POLL"/>
       </column>
-      <column name="QUESTION" type="NVARCHAR(2000)">
+      <column name="QUESTION" type="VARCHAR(2000)">
         <constraints nullable="false"/>
       </column>
       <column name="CREATED_DATE" type="TIMESTAMP" defaultValueComputed="NULL"/>
@@ -54,12 +56,12 @@
       <column name="POLL_ID" type="BIGINT">
         <constraints foreignKeyName="FK_OPTION_POLL" references="POLL(POLL_ID)" nullable="false" />
       </column>
-      <column name="DESCRIPTION" type="NVARCHAR(2000)">
+      <column name="DESCRIPTION" type="VARCHAR(2000)">
         <constraints nullable="false"/>
       </column>
     </createTable>
     <modifySql dbms="mysql">
-      <append value=" ENGINE=INNODB CHARSET=UTF8 COLLATE utf8_general_ci"/>
+      <append value=" ENGINE=INNODB CHARSET=UTF8MB4 COLLATE utf8mb4_0900_ai_ci"/>
     </modifySql>
   </changeSet>
 
@@ -75,6 +77,7 @@
   </changeSet>
 
   <changeSet author="poll" id="1.0.0-4">
+    <validCheckSum>9:15180130844bb18ab33da5d7a650dafd</validCheckSum>
     <createTable tableName="POLL_VOTE">
       <column name="POLL_VOTE_ID" type="BIGINT" autoIncrement="${autoIncrement}" startWith="1">
         <constraints nullable="false" primaryKey="true" primaryKeyName="PK_POLL_VOTE"/>
@@ -88,12 +91,17 @@
       </column>
     </createTable>
     <modifySql dbms="mysql">
-      <append value=" ENGINE=INNODB CHARSET=UTF8 COLLATE utf8_general_ci"/>
+      <append value=" ENGINE=INNODB CHARSET=UTF8MB4 COLLATE utf8mb4_0900_ai_ci"/>
     </modifySql>
   </changeSet>
 
   <changeSet author="poll" id="1.0.0-6">
     <addUniqueConstraint columnNames="POLL_OPTION_ID,VOTER_ID" tableName="POLL_VOTE" />
   </changeSet>
-
-</databaseChangeLog>
+  <changeSet author="poll" id="1.0.0-7" >
+    <sql dbms="mysql">
+      ALTER TABLE POLL_OPTION CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
+      ALTER TABLE POLL_VOTE CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
+    </sql>
+  </changeSet>
+</databaseChangeLog>