[PM-40858] deps: Update vite in Streamlit example frontend

[sognefej]

Ticket

• Closes PM-40858

Description

Updates vite from 5.2.10 to 6.4.3 in the Streamlit example's frontend devDependencies and regenerates package-lock.json.

Regenerating the lockfile also removes a stale @passwordlessdev/passwordless-client entry. That package isn't listed in package.json and isn't imported by the frontend (the client is loaded from the CDN in src/main.js).

Checklist

I did the following to ensure that my changes were tested thoroughly:

• Clean npm ci and npm run build in examples/streamlit/passwordless_auth/frontend
• Started the Vite dev server and confirmed the page and src/main.js load

I did the following to ensure that my changes do not introduce security vulnerabilities:

• Ran npm audit against the updated lockfile (0 findings)
• Reviewed the lockfile diff for unexpected additions or removals