Bump org.yaml:snakeyaml from 2.3 to 2.4 (#1183)

Bumps [org.yaml:snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 2.3 to 2.4.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-2.4..snakeyaml-2.3)

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

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planetiler-openmaptiles.pom.xml

@@ -25,7 +25,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>2.3</version>
+      <version>2.4</version>
     </dependency>
     <dependency>
       <groupId>org.commonmark</groupId>