Bug Description:

In our current package-lock.json uses perfect-scrollbar 1.5.6, which does not work with Theia (see #14586). We have an entry in the overrides section of our main package.json that tries to fix the version to 1.5.5, but it does not seem to have the desired effect.

Additional Information

• Operating System: Windows
• Theia Version: 1.59 master