Update dependency org.mybatis:mybatis to v3.5.15

Author: renovate[bot]

pom.xml

@@ -110,7 +110,7 @@
     <java.release.version>17</java.release.version>
 
     <derby.version>10.17.1.0</derby.version>
-    <mybatis.version>3.5.14</mybatis.version>
+    <mybatis.version>3.5.15</mybatis.version>
     <spring.version>6.1.2</spring.version>
     <spring-batch.version>5.1.0</spring-batch.version>
     <module.name>org.mybatis.spring</module.name>