Update dependency org.springdoc:springdoc-openapi-starter-webflux-ui to v2.8.13 (#157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gateway-service/pom.xml

@@ -37,7 +37,7 @@
         <dependency>
             <groupId>org.springdoc</groupId>
             <artifactId>springdoc-openapi-starter-webflux-ui</artifactId>
-            <version>2.8.11</version>
+            <version>2.8.13</version>
         </dependency>
     </dependencies>