deps: update debug from 3.1.0 to ~4.4.0

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Summary

Upgrade debug runtime dependency from 3.1.0 to ~4.4.0.

Motivation

The debug package has had significant improvements and fixes since v3.x (released 2017). The require('debug')('name') API is fully backward-compatible — no code changes needed.

This is part of a series of debug upgrades across the expressjs ecosystem to bring runtime dependencies up to date.

Testing

• npm install succeeds
• npm test passes: 19/19 ✅
• No source code changes required

Changes

• package.json: "debug": "3.1.0" → "debug": "~4.4.0"

Related

• deps: update debug from 2.6.9 to ~4.4.0 morgan#364 (same upgrade)
• deps: update debug from 2.6.9 to ~4.4.0 compression#279 (same upgrade)
• deps: update debug from ~2.6.9 to ~4.4.0 session#1141 (same upgrade)
• deps: update debug from 2.6.9 to ~4.4.0 serve-index#169 (same upgrade)
• deps: update debug from 3.2.7 to ~4.4.0 cookie-session#222 (same upgrade)

🤖 Generated with Claude Code

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Closing after re-review. The proposed ~4.4.0 range can select the compromised debug@4.4.2 release from cached registries, and there is no method-override-specific issue or behavior test justifying the major upgrade.