Bump org.yaml:snakeyaml from 2.2 to 2.3

Bumps [org.yaml:snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 2.2 to 2.3.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-2.3..snakeyaml-2.2)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

core/pom.xml

@@ -279,7 +279,7 @@
         <dependency>
             <groupId>org.yaml</groupId>
             <artifactId>snakeyaml</artifactId>
-            <version>2.2</version>
+            <version>2.3</version>
             <scope>test</scope>
         </dependency>
     </dependencies>