fix: update Node.js prerequisite from >=18 to >=20 in DEVELOPMENT.md

[SRSoham]

Fixes #2173

Summary

Updated the Node.js version requirement in DEVELOPMENT.md Prerequisites
table to match the actual engine constraint in package.json (>=20.0.0).

Changes Made

• Updated Node.js version from >= 18 to >= 20 in DEVELOPMENT.md

Testing

• Verified package.json engines field: "node": ">=20.0.0"
• Verified DEVELOPMENT.md Prerequisites table now matches

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus