Force versions in the examples

[catarina-correia]

Summary

Force specific versions for Netty and Tomcat dependencies in the example Spring Boot applications.

Changes

• Pin netty.version to 4.2.13.Final in both web and webflux example build configurations
• Pin tomcat.version to 11.0.22 in both example modules
• Ensures consistent transitive dependency resolution across example projects

Impact

• Stabilizes example builds and reduces version mismatch issues
• Affects only example modules, not core library code
• No functional changes to production code

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