Update Postgres tutorial to use node-postgres

[harshil1712]

Summary

Updates the Workers Postgres tutorial to use node-postgres.

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

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PR Change Summary

Updated the Workers Postgres tutorial to utilize the node-postgres library for database connections.

• Replaced the postgres library with node-postgres (pg) in the tutorial.
• Updated installation instructions to include TypeScript types for pg.
• Modified code examples to reflect the new connection method using the Client class from pg.
• Adjusted the tutorial to ensure compatibility with the latest version of node-postgres.

Modified Files

• src/content/docs/workers/tutorials/postgres/index.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @korinne, @WalshyDev, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing, @kodster28, @cloudflare/wrangler, @cloudflare/workers-runtime-1, @cloudflare/wrangler

[github-actions]

Preview URL: https://c9cfe641.preview.developers.cloudflare.com
Preview Branch URL: https://update-postgres-tutorial.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/tutorials/postgres/	https://update-postgres-tutorial.preview.developers.cloudflare.com/workers/tutorials/postgres/