fix(regex): exclude @ as first letter for password regex

[MathildeJolly]

No description provided.

[changeset-bot]

🦋 Changeset detected

Latest commit: 347990f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@scaleway/regex	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.92%. Comparing base (8b076aa) to head (347990f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2536   +/-   ##
=======================================
  Coverage   78.92%   78.92%           
=======================================
  Files          26       26           
  Lines         859      859           
  Branches      110      110           
=======================================
  Hits          678      678           
  Misses        169      169           
  Partials       12       12           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.