deps: update dependency org.yaml:snakeyaml to v2.3 (#3158)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.yaml:snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml/src) |
`2.2` -> `2.3` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/org.yaml:snakeyaml/2.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.yaml:snakeyaml/2.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.yaml:snakeyaml/2.2/2.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.yaml:snakeyaml/2.2/2.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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gapic-generator-java/pom.xml

@@ -436,7 +436,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>2.2</version>
+      <version>2.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.googlejavaformat</groupId>