Fix migration for MariaDB 12.2.2 (#7265)

Co-authored-by: Timshel <timshel@users.noreply.github.com>

migrations/mysql/2024-03-13-170000_sso_users_cascade/up.sql

@@ -1,15 +1,31 @@
--- Dynamically create DROP FOREIGN KEY
--- Some versions of MySQL or MariaDB might fail if the key doesn't exists
--- This checks if the key exists, and if so, will drop it.
-SET @drop_sso_fk = IF((SELECT true FROM information_schema.TABLE_CONSTRAINTS WHERE
-    CONSTRAINT_SCHEMA = DATABASE() AND
-    TABLE_NAME = 'sso_users' AND
-    CONSTRAINT_NAME = 'sso_users_ibfk_1' AND
-    CONSTRAINT_TYPE = 'FOREIGN KEY') = true,
-    'ALTER TABLE sso_users DROP FOREIGN KEY sso_users_ibfk_1',
-    'SELECT 1');
-PREPARE stmt FROM @drop_sso_fk;
-EXECUTE stmt;
-DEALLOCATE PREPARE stmt;
+SELECT if (
+    EXISTS(
+        SELECT CONSTRAINT_NAME FROM information_schema.table_constraints
+            WHERE TABLE_SCHEMA = DATABASE()
+                AND TABLE_NAME = 'sso_users'
+                AND CONSTRAINT_TYPE = 'FOREIGN KEY'
+                AND CONSTRAINT_NAME = 'sso_users_ibfk_1'
+    )
+    ,'ALTER TABLE sso_users DROP FOREIGN KEY `sso_users_ibfk_1`'
+    ,'SELECT "info: FK sso_users_ibfk_1 does not exist."'
+) INTO @drop_stmt;
+PREPARE drop_stmt FROM @drop_stmt;
+EXECUTE drop_stmt;
+
+SELECT if (
+    EXISTS(
+        SELECT CONSTRAINT_NAME FROM information_schema.table_constraints
+            WHERE TABLE_SCHEMA = DATABASE()
+                AND TABLE_NAME = 'sso_users'
+                AND CONSTRAINT_TYPE = 'FOREIGN KEY'
+                AND CONSTRAINT_NAME = '1'
+    )
+    ,'ALTER TABLE sso_users DROP FOREIGN KEY `1`'
+    ,'SELECT "info: FK sso_users 1 does not exist."'
+) INTO @drop_stmt;
+PREPARE drop_stmt FROM @drop_stmt;
+EXECUTE drop_stmt;
+
+DEALLOCATE PREPARE drop_stmt;
 
 ALTER TABLE sso_users ADD FOREIGN KEY(user_uuid) REFERENCES users(uuid) ON UPDATE CASCADE ON DELETE CASCADE;