Upgrade Swagger 1.6.15 -> 1.6.16 (#1681)

See:
- https://github.com/swagger-api/swagger-core/releases/tag/v1.6.16
- swagger-api/swagger-core@v1.6.15...v1.6.16

Author: Picnic-DevPla-Bot

pom.xml

@@ -385,7 +385,7 @@
             <dependency>
                 <groupId>io.swagger</groupId>
                 <artifactId>swagger-annotations</artifactId>
-                <version>1.6.15</version>
+                <version>1.6.16</version>
             </dependency>
             <dependency>
                 <groupId>io.swagger.core.v3</groupId>