Upgrade to slf4j 1.7.26

Author: kazuki43zoo

pom.xml

@@ -159,13 +159,13 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>1.7.25</version>
+      <version>1.7.26</version>
       <optional>true</optional>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
-      <version>1.7.25</version>
+      <version>1.7.26</version>
       <optional>true</optional>
     </dependency>
     <dependency>