Update dependency org.springdoc:springdoc-openapi-starter-webmvc-ui to v2.8.13 (#2826)

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

Author: renovate[bot]

build.gradle

@@ -196,7 +196,7 @@ dependencies {
   implementation group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa'
   implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-openfeign', version: '4.3.0'
   implementation group: 'org.checkerframework', name: 'checker-qual', version: '3.51.0'
-  implementation group: 'org.springdoc', name: 'springdoc-openapi-starter-webmvc-ui', version: '2.8.12'
+  implementation group: 'org.springdoc', name: 'springdoc-openapi-starter-webmvc-ui', version: '2.8.13'
   implementation group: 'com.google.guava', name: 'guava', version: '33.4.8-jre'
   implementation group: 'com.github.hmcts.java-logging', name: 'logging', version: versions.reformLogging
   implementation group: 'com.github.hmcts.java-logging', name: 'logging-appinsights', version: versions.reformLogging