chore: update webview dependencies to fix npm audit

This MR updates dependencies in the webview section of the extension. (The webview is responsible for rendering MR and Issue details using Vue components.).

There has been no change to the application logic and I built the project and tested that the webview still works as expected.

Reduces the amount of critical and high severity dependency issues

Current main: https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/security/dashboard/?state=DETECTED&state=CONFIRMED

With these changes: https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/pipelines/199223291/security