Bump snakeyaml in /thinking-in-spring/configuration-metadata

Bumps [snakeyaml](https://bitbucket.org/asomov/snakeyaml) from 1.18 to 1.26.
- [Commits](https://bitbucket.org/asomov/snakeyaml/branches/compare/snakeyaml-1.26..v1.18)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:production
...

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Author: dependabot[bot]

thinking-in-spring/configuration-metadata/pom.xml

@@ -24,7 +24,7 @@
         <dependency>
             <groupId>org.yaml</groupId>
             <artifactId>snakeyaml</artifactId>
-            <version>1.18</version>
+            <version>1.26</version>
         </dependency>
 
     </dependencies>