fix(deps): pin spring-framework version to 7.0.8 in example apps (GHSA-h3qp-gqrc-q736)

Add ext['spring-framework.version'] override in both example Spring Boot
apps (example-spring-boot-starter-web and example-spring-boot-starter-webflux),
in lockstep with the resolutionStrategy floor added for spring-webmvc and
spring-webflux in the root build.gradle. These examples use the Spring
Dependency Management plugin's strict BOM import, which is not affected by
resolutionStrategy.eachDependency and requires its own ext[] property
override to move the floor, following the same pattern already used there
for jackson, logback, netty and tomcat.

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

Author: claude

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

@@ -10,6 +10,7 @@ ext['jackson-2-bom.version'] = '2.21.5'
 ext['logback.version'] = '1.5.34'
 ext['netty.version'] = '4.2.16.Final'
 ext['tomcat.version'] = '11.0.22'
+ext['spring-framework.version'] = '7.0.8'
 
 dependencies {
     implementation project(':examples:examples-common')

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

@@ -10,6 +10,7 @@ ext['jackson-2-bom.version'] = '2.21.5'
 ext['logback.version'] = '1.5.34'
 ext['netty.version'] = '4.2.16.Final'
 ext['tomcat.version'] = '11.0.22'
+ext['spring-framework.version'] = '7.0.8'
 
 dependencies {
     implementation project(':examples:examples-common')