Maven pom.xml(deps): Bump swagger-annotations from 2.2.4 to 2.2.6 (#140)

Bumps swagger-annotations from 2.2.4 to 2.2.6.

---
updated-dependencies:
- dependency-name: io.swagger.core.v3:swagger-annotations
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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core/pom.xml

@@ -55,7 +55,7 @@
         <dependency>
             <groupId>io.swagger.core.v3</groupId>
             <artifactId>swagger-annotations</artifactId>
-            <version>2.2.4</version>
+            <version>2.2.6</version>
         </dependency>
 
         <dependency>