Add `@latest` to `npx try-prisma` instructions in READMEs

[Nikolas]

Instead of npx try-prisma the instructions in a README should say: npx try-prisma@latest to prevent any errors.

See this internal conversation: https://prisma-company.slack.com/archives/C03HQ86CJ76/p1677578448281579

[Alex Ruheni]

This has been taken care of in #4532