Update dependency org.mybatis:mybatis to v3.5.15

Author: renovate[bot]

pom.xml

@@ -76,7 +76,7 @@
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
-      <version>3.5.14</version>
+      <version>3.5.15</version>
       <scope>provided</scope>
     </dependency>