fix(deps): bump io.netty vulnerability floor to 4.2.16.Final (USPR-13774)

Remediates GHSA-jppx-w49h-x2qq (ByteBuf Reference Leak on RST_STREAM) which causes
native memory exhaustion under high RST_STREAM traffic. Update the minimum io.netty
version floor from 4.2.15.Final to 4.2.16.Final in both the root resolutionStrategy
and in the example Spring Boot applications to maintain consistency.

Fixes Dependabot alert #107.

Co-Authored-By: Catarina Correia <catarina.correia@getyourguide.com>

Author: claude

build.gradle

@@ -49,13 +49,14 @@ subprojects {
                 because('GHSA-rv64-5gf8-9qq8 / GHSA-x4m4-345f-5h5g / GHSA-24j9-x2wg-9qv6 / GHSA-gx5v-xp9w-j4cg: Apache Tomcat < 11.0.22 vulnerabilities')
             }
             if (requested.group == 'io.netty'
-                    && requested.version != null && requested.version < '4.2.15.Final') {
-                useVersion('4.2.15.Final')
+                    && requested.version != null && requested.version < '4.2.16.Final') {
+                useVersion('4.2.16.Final')
                 because('GHSA-38f8-5428-x5cv: HTTP Request Smuggling in io.netty:netty-codec-http via malformed Transfer-Encoding headers; ' +
                         'GHSA-3qp7-7mw8-wx86 / GHSA-c2rx-5r8w-8xr2 / GHSA-cmm3-54f8-px4j / GHSA-x4gw-5cx5-pgmh / GHSA-676x-f7gg-47vc / ' +
                         'GHSA-5pvg-856g-cp85 / GHSA-4grm-h2qv-h6w6 / GHSA-c653-97m9-rcg9 / GHSA-563q-j3cm-6jxm / GHSA-hvcg-qmg6-jm4c / ' +
                         'GHSA-cq4q-cv5g-r8q5 / GHSA-c2gf-v879-257j / GHSA-5x3r-wrvg-rp6q / GHSA-xmv7-r254-6q78 / GHSA-w573-9ffj-6ff9: ' +
-                        'multiple Netty vulnerabilities fixed in 4.2.15.Final')
+                        'multiple Netty vulnerabilities fixed in 4.2.15.Final; ' +
+                        'GHSA-jppx-w49h-x2qq: Netty ByteBuf Reference Leak on RST_STREAM (native memory exhaustion) fixed in 4.2.16.Final')
             }
         }
     }

examples/example-spring-boot-starter-web/build.gradle

@@ -8,7 +8,7 @@ plugins {
 ext['jackson-bom.version'] = '3.1.4'
 ext['jackson-2-bom.version'] = '2.21.5'
 ext['logback.version'] = '1.5.34'
-ext['netty.version'] = '4.2.15.Final'
+ext['netty.version'] = '4.2.16.Final'
 ext['tomcat.version'] = '11.0.22'
 
 dependencies {

examples/example-spring-boot-starter-webflux/build.gradle

@@ -8,7 +8,7 @@ plugins {
 ext['jackson-bom.version'] = '3.1.4'
 ext['jackson-2-bom.version'] = '2.21.5'
 ext['logback.version'] = '1.5.34'
-ext['netty.version'] = '4.2.15.Final'
+ext['netty.version'] = '4.2.16.Final'
 ext['tomcat.version'] = '11.0.22'
 
 dependencies {