chore(catalog): record boot-3.5.6+rebuild.1

[github-actions]

Adds boot 3.5.6 → boot-3.5.6+rebuild.1 and the converted tree under markdown/boot/3.5.6/, published by the release workflow.

---

Summary by cubic

Records the rebuilt boot 3.5.6 release in the catalog and publishes its converted docs.

• Updates catalog.json to point the 3.5.6 entry at tag boot-3.5.6+rebuild.1 with the new release timestamp.
• Replaces {version-spring-boot} and {version-graal} placeholders in the markdown/boot/3.5.6/ docs with concrete values (3.5.6, 22.3).

^{Written for commit c61e8ad. Summary will update on new commits.}

[greptile-apps]

PR author is in the excluded authors list.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}

[amondnet]

Superseded by #247, which records all 47 Boot rebuilds in one commit.