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fix: upgrade handlebars to 4.7.9 (CVE-2026-33937)

fix: upgrade handlebars to 4.7.9 (CVE-2026-33937): a task in repo2rlenv-pr-diff (Harbor dataset). Title: fix: upgrade handlebars to 4.7.9 (CVE-2026-33937)

The task

**Title:** fix: upgrade handlebars to 4.7.9 (CVE-2026-33937)

Part of FineEnvs/repo2rlenv-pr-diff.