Bump io.jenkins.plugins:snakeyaml-api in /bom-weekly (#3439)

Bumps [io.jenkins.plugins:snakeyaml-api](https://github.com/jenkinsci/snakeyaml-api-plugin) from 2.2-111.vc6598e30cc65 to 2.2-121.v5a_68b_9300b_d4.
- [Release notes](https://github.com/jenkinsci/snakeyaml-api-plugin/releases)
- [Commits](https://github.com/jenkinsci/snakeyaml-api-plugin/commits)

---
updated-dependencies:
- dependency-name: io.jenkins.plugins:snakeyaml-api
  dependency-type: direct:production
...

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bom-weekly/pom.xml

@@ -433,7 +433,7 @@
       <dependency>
         <groupId>io.jenkins.plugins</groupId>
         <artifactId>snakeyaml-api</artifactId>
-        <version>2.2-111.vc6598e30cc65</version>
+        <version>2.2-121.v5a_68b_9300b_d4</version>
       </dependency>
       <dependency>
         <groupId>io.jenkins.plugins</groupId>