fix: upgrade vitest package to ^4.1.8

[yassinedorbozgithub]

Summary

This PR upgrades the vitest dependency to version ^4.1.8.

Changes

• Updated vitest from the previous version to ^4.1.8.
• Incorporated upstream security fixes and dependency updates included in the latest release.

Security Benefits

This upgrade addresses a security issue related to CWE-862: Missing Authorization, where insufficient authorization checks could potentially allow unintended access to protected functionality under certain conditions.

By upgrading to vitest ^4.1.8, we benefit from:

• Improved authorization and access-control handling in affected code paths.
• Reduced risk of unauthorized operations during test execution or related tooling workflows.
• Alignment with the latest security recommendations and dependency maintenance practices.
• Reduced exposure to known vulnerabilities reported against older versions.

Testing

• Existing test suite passes successfully with vitest ^4.1.8.
• No application code changes were required beyond the dependency update.