Bump snakeyaml from 1.30 to 2.0 in /helix-core (#2398)

Bumps [snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 1.30 to 2.0.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-2.0..snakeyaml-1.30)

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

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helix-core/pom.xml

@@ -142,7 +142,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>1.30</version>
+      <version>2.0</version>
     </dependency>
     <dependency>
       <groupId>io.dropwizard.metrics</groupId>