chore: Upgrade to node v20 as v18 is EOL next month

[emrysal]

What does this PR do?

Upgrades @types/node to Node 20 & runs tests using Node 20.

─ @calcom/atoms@workspace:packages/platform/atoms [65b34]
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)
│
├─ @calcom/atoms@workspace:packages/platform/atoms
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)
│
├─ @calcom/base@workspace:packages/platform/examples/base
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)
│
├─ @calcom/example-app-credential-sync@workspace:example-apps/credential-sync
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)
│
├─ @calcom/platform-libraries@workspace:packages/platform/libraries
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)
│
├─ @calcom/types@workspace:packages/types
│  └─ @types/node@npm:20.17.23 (via npm:^20.17.23)

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Package	New capabilities	Transitives	Size	Publisher

🚮 Removed packages: npm/@types/node@16.9.1

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[graphite-app]

Graphite Automations

"Add foundation team as reviewer" took an action on this PR • (03/05/25)

1 reviewer was added to this PR based on Keith Williams's automation.

[github-actions]

E2E results are ready!

• Workflow #50214.1 latest results