Merge pull request #643 from mybatis/dependabot/maven/spring.version-5.3.15

Bump spring.version from 5.3.14 to 5.3.15

Author: kazuki43zoo

pom.xml

@@ -106,7 +106,7 @@
     <osgi.dynamicImport>*</osgi.dynamicImport>
 
     <mybatis.version>3.5.9</mybatis.version>
-    <spring.version>5.3.14</spring.version>
+    <spring.version>5.3.15</spring.version>
     <spring-batch.version>4.3.4</spring-batch.version>
     <module.name>org.mybatis.spring</module.name>