Bump org.yaml:snakeyaml from 2.1 to 2.2

Bumps [org.yaml:snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 2.1 to 2.2.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-2.2..snakeyaml-2.1)

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

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

modello-plugins/modello-plugin-snakeyaml/pom.xml

@@ -24,7 +24,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>2.1</version>
+      <version>2.2</version>
     </dependency>
   </dependencies>
 </project>