Bump opencsv from 5.5.2 to 5.6 (apache#221)

Bumps opencsv from 5.5.2 to 5.6.

---
updated-dependencies:
- dependency-name: com.opencsv:opencsv
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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pom.xml

@@ -453,7 +453,7 @@
         <dependency>
           <groupId>com.opencsv</groupId>
           <artifactId>opencsv</artifactId>
-          <version>5.5.2</version>
+          <version>5.6</version>
           <scope>test</scope>
         </dependency>