[Repo Assist] chore: bump `@types/node` to ^20 and `@types/mocha` to ^10

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Summary

Updates two stale devDependencies that have been pinned to 2017 releases for ~8 years:

Package	Before	After
@types/node	^7.0.43	^20.0.0
@types/mocha	^2.2.42	^10.0.0

Why

@types/node ^7 predates many Node.js built-in APIs used in this project (path, fs, os, cp, child_process). Modern type definitions provide:

• Accurate IntelliSense and autocomplete in VS Code
• Correct type signatures for fs.existsSync, path.join, os.tmpdir, cp.spawn, etc.
• Type support for Node.js's built-in node:test runner used in test/unit.test.js

@types/node ^20 aligns with Node.js 20 LTS, which is the runtime version shipping with current VS Code extension hosts.

@types/mocha ^10 similarly aligns with the current Mocha release.

Scope

• No production code changes — devDependencies only; zero runtime impact.
• package.json change only (one file, 2-line change).
• Does not change typescript, vscode, or eslint versions (those warrant separate discussions).

Test Status

All 7 unit tests pass unchanged:

# tests 7
# pass 7
# fail 0

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