Bump org.yaml:snakeyaml from 1.31 to 2.0 in /plugins/json (#634)

Bumps [org.yaml:snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 1.31 to 2.0.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-2.0..snakeyaml-1.31)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:production
...

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plugins/json/pom.xml

@@ -73,7 +73,7 @@
         <dependency>
             <groupId>org.yaml</groupId>
             <artifactId>snakeyaml</artifactId>
-            <version>1.31</version>
+            <version>2.0</version>
         </dependency>
         <dependency>
             <groupId>kg.apc</groupId>