docs: update node version instructions

[jzaki]

• [x] update prerequisite to v22 (min v20)
• [x] review Contract Tutorials (minor fix)
• Review Full-Stack Tutorials
  • [x] Getting started with Aztec.js
  • [x] Node.js app that interacts with contracts
  • [x] Token Bridge Tutorial
  • [x] Uniswap Bridge
• [x] Apply fixes to all versioned_docs
• [x] Apply node version updates to relevant versioned_docs

[github-actions[bot]]

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