Align Jackson annotations with 2.22

[skrcode]

Summary

Completes the Jackson 2.22 upgrade in Dependabot PR #1299.

Jackson Annotations uses the release version 2.22, while Jackson Databind and Jackson Core use 2.22.0. Sharing the existing ${jackson.version} property therefore makes Maven request the unpublished artifact jackson-annotations:2.22.0.

Change

• add a dedicated jackson.annotations.version property set to 2.22
• keep the other Jackson modules on 2.22.0
• make no Java source or runtime behavior changes

Verification

• reproduced the exact bot-head failure on 9b7ab1000ba91421b1bbce5bb4790328154b2e87: Maven could not resolve com.fasterxml.jackson.core:jackson-annotations:2.22.0
• ./mvnw -B -ntp -pl a2a test on Java 21: 93 tests passed
• ./mvnw -B -ntp test on Java 21: all 21 reactor modules passed; the core suite ran 1,449 tests with 24 skips
• ./mvnw -Prelease clean package on Java 21: all 21 reactor modules passed
• JAIPilot Remote, Java 17: ./mvnw -B -ntp -pl a2a -am test passed; core and A2A modules succeeded, including all 93 A2A tests
• the configured formatter processed the A2A sources with zero rewrites; git diff --check passed

The repair is a single signed-off commit and changes only a2a/pom.xml (two insertions, one deletion).

Built and verified with JAIPilot:

• Skills: jaipilot-maintainer-intent, jaipilot-fast-execution, jaipilot-review-diff, and jaipilot-remote-java
• Execution profile: gpt-5.6-sol · xhigh · fast

[hemasekhar-p]

Hi @skrcode, thank you for your contribution! We appreciate you taking the time to submit this pull request. Currently this PR is under review by our team, we will keep you posted if any additional information is required. thank you.