Upgrade to snakeyaml 2.3

Author: gaul

apis/byon/pom.xml

@@ -70,7 +70,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>2.0</version>
+      <version>2.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.auto.service</groupId>