Bump swagger-annotations from 2.2.4 to 2.2.6 in /api-first-server (#31)

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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api-first-server/pom.xml

@@ -16,7 +16,7 @@
 
     <properties>
         <java.version>11</java.version>
-        <swagger-annotations-version>2.2.4</swagger-annotations-version>
+        <swagger-annotations-version>2.2.6</swagger-annotations-version>
         <springfox-version>3.0.0</springfox-version>
         <jackson-databind-nullable>0.2.4</jackson-databind-nullable>
     </properties>