chore(catalog): record boot-3.4.2+rebuild.1

[github-actions]

Adds boot 3.4.2 → boot-3.4.2+rebuild.1 and the converted tree under markdown/boot/3.4.2/, published by the release workflow.

---

Summary by cubic

Records the boot-3.4.2+rebuild.1 rebuild in the catalog and updates the converted docs for boot 3.4.2.

• Catalog now points boot 3.4.2 at tag boot-3.4.2+rebuild.1 with the new release timestamp.
• Replaces Spring Boot and Testcontainers version placeholders in markdown/boot/3.4.2/ with concrete values.

^{Written for commit e869d07. 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

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TIP This summary will be updated as you push new changes.}

[amondnet]

Superseded by #247, which records all 47 Boot rebuilds in one commit.