FORGE-585 Upgrade IP Filter plugin to brXM 17.0.0 (v6.0.0)

[joeyliechty]

What

Upgrades the IP Filter plugin and demo from brXM 16 to brXM 17.0.0, bumping the plugin version from 5.x to 6.0.0. Changes are pom-only — no Java source changes required.

• hippo-cms7-project parent: 16.7.0 -> 17.0.0 (Java 21, Spring Framework 7, Spring Security 7)
• hippo-cms7-release in demo: 16.7.0 -> 17.0.0
• Plugin version: 5.0.3-SNAPSHOT -> 6.0.0-SNAPSHOT across all modules
• Removed dead spring-mock 2.0.8 test dependency from hst module (JAR unresolvable; no test code used it)

A support/5.x maintenance branch was cut from develop before this upgrade.

Why

Resolves FORGE-585 — part of FORGE-582 epic to upgrade all Forge plugins to brXM v17. The jakarta.servlet migration was already complete. Spring Security 7 IpAddressMatcher API is unchanged.

How to test

1. Build: JAVA_HOME=jdk21 mvn clean install — 5 unit tests pass
2. Demo: JAVA_HOME=jdk21 mvn clean verify -DskipTests -f demo/pom.xml
3. Run: JAVA_HOME=jdk21 mvn -Pcargo.run -f demo/pom.xml
4. Open http://localhost:8080/cms — confirm IpFilterModule.doInitialize and CmsIpFilter: Successfully configured IpFilterService appear in logs

Checklist

• Unit tests passing (5/5)
• Demo builds and starts cleanly on brXM 17 / Java 21 / Tomcat 10
• IP filter CMS and HST modules initialize correctly at runtime
• support/5.x maintenance branch created from pre-upgrade develop
• No breaking API changes (pure version bump)
• No Java source changes required

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