Update feign monorepo to v13.6 (#646)

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

Author: renovate[bot]

build.gradle

@@ -289,8 +289,8 @@ dependencies {
   implementation group: 'com.nimbusds', name: 'nimbus-jose-jwt', version: '10.6'                    // spring-boot-starter-oauth2-client
   implementation group: 'commons-fileupload', name: 'commons-fileupload', version: '1.6.0'              // spring-cloud-starter-openfeign
   implementation group: 'commons-io', name: 'commons-io', version: '2.21.0'                           // spring-cloud-starter-openfeign
-  implementation group: 'io.github.openfeign', name: 'feign-httpclient', version: '13.5'              // idam-java-client
-  implementation group: 'io.github.openfeign', name: 'feign-jackson', version: '13.5'                 // idam-java-client
+  implementation group: 'io.github.openfeign', name: 'feign-httpclient', version: '13.6'              // idam-java-client
+  implementation group: 'io.github.openfeign', name: 'feign-jackson', version: '13.6'                 // idam-java-client
   implementation group: 'io.github.openfeign.form', name: 'feign-form', version: '3.8.0'              // feign-form-spring
   implementation group: 'io.github.openfeign.form', name: 'feign-form-spring', version: '3.8.0'       // spring-cloud-starter-openfeign
   implementation group: 'jakarta.xml.bind', name: 'jakarta.xml.bind-api', version: '4.0.2'            // jaxb-runtime