ci: update node and actions version

[jaissica12]

Background

• Local/CI installs and TypeDoc builds were failing due to a legacy git‑based TypeDoc theme that pulled node-sass@4.x (requires Python 2) and an older typedoc@0.20.x that only supports TypeScript ≤4.2.
• Type checking on TS ≥5 and modern Node types caused issues (ESNext.Disposable, Buffer iterator types).
• @types/sinon conflicted with Sinon’s built‑in types
• GitHub Actions referenced deprecated actions/Node versions, leading to EBADENGINE warnings on Node 18 and occasional artifact name collisions.
• BaseEvent#toEventAPIObject was an abstract property with a default initializer, which is invalid in TypeScript 5.

What Has Changed

• src/events.ts

  • Convert abstract toEventAPIObject = (): void => {} to abstract toEventAPIObject(): EventAPIObject; for TS 5 compatibility.

• typedoc.json

  • Removed deprecated "mode": "file".
  • Dropped custom typedoc-default-themes line (now uses TypeDoc’s default theme).

• package.json

  • Tooling: typedoc → ^0.28.15, typescript → ^5.9.3, @types/node → ^20.
  • Semantic‑release plugins bumped up
  • Removed legacy typedoc-default-themes (removes node-sass postinstall).
  • Added @sinonjs/fake-timers@^8 for stable timer tests

• .github/workflows/pull-request.yml

  • Migrated to actions/checkout@v4, actions/setup-node@v4.
  • PR matrix: node-version: [20.x, 22.x, 24.x] (removes Node 18 from CI).
  • artifact upload name made unique to avoid (409) Conflict: npm-logs-${{ github.job }}-${{ matrix.node-version || 'latest' }}-run${{ github.run_attempt }}.

• .github/workflows/release.yml

  • Uses actions/*@v4, node-version: 24.x.

• .github/dependabot.yml

  • Add global ignore for @types/sinon to prevent reintroduction and noisy version bumps (Sinon includes its own types).

Screenshots/Video

• {Include any screenshots or video demonstrating the new feature or fix, if applicable}

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Additional Notes

• {Any additional information or context relevant to this PR}

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://go/j/SDKE-684

[rmi22186]

@jaissica12 - should be merged to master first since it's ci/cd