chore(catalog): record boot-3.4.9+rebuild.1

[github-actions]

Adds boot 3.4.9 → boot-3.4.9+rebuild.1 and the converted tree under markdown/boot/3.4.9/, published by the release workflow.

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Summary by cubic

Records the boot-3.4.9+rebuild.1 tag in the catalog and replaces version placeholders in the converted 3.4.9 docs with the concrete version, so published docs no longer show tokens like {version-spring-boot}.

• Updates catalog.json to point the 3.4.9 entry at the rebuild tag and refreshes generated_at.
• Replaces {version-spring-boot} and {version-graal} placeholders in the 3.4.9 markdown tree with 3.4.9 and 22.3.

^{Written for commit a3c424c. 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

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Superseded by #247, which records all 47 Boot rebuilds in one commit.