Upgrade Swagger 2.2.20 -> 2.2.21 (#1102)

See:
- https://github.com/swagger-api/swagger-core/releases/tag/v2.2.21
- swagger-api/swagger-core@v2.2.20...v2.2.21

pom.xml

@@ -377,7 +377,7 @@
             <dependency>
                 <groupId>io.swagger.core.v3</groupId>
                 <artifactId>swagger-annotations</artifactId>
-                <version>2.2.20</version>
+                <version>2.2.21</version>
             </dependency>
             <dependency>
                 <groupId>jakarta.servlet</groupId>